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Document and Entity Information	12 Months Ended
Document and Entity Information	Dec. 31, 2011 USD ($) shares
Entity Registrant Name	ZETA ACQUISITION CORP II
Entity Central Index Key	0001422142
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	zetaii
Entity Common Stock, Shares Outstanding \| shares	0
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2011
Entity Well-Known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float \| $	$ 0

Balance Sheets - USD ($)	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 4,125	$ 26,898
Prepaid expenses	2,500	2,500
Total assets	6,625	29,398
Liabilities and stockholders' deficit
Accounts payable	2,977	2,165
Accrued interest	6,324	2,724
Accrued expenses	5,500	5,500
Notes payable, stockholders	60,000	60,000
Total liabilities	74,801	70,389
Stockholders' deficit
Preferred stock, $0.0001 par value; 10,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value; 100,000,000 shares authorized; 5,000,000 shares issued and outstanding	500	500
Additional paid-in capital	49,500	49,500
Deficit accumulated during the development stage	(118,176)	(90,991)
Total stockholders' deficit	(68,176)	(40,991)
Total liabilities and stockholders' deficit	$ 6,625	$ 29,398

Balance Sheets [Parenthetical] - $ / shares	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	5,000,000	5,000,000
Common stock, shares outstanding	5,000,000	5,000,000

Statements of Operations - USD ($)	12 Months Ended		49 Months Ended
Statements of Operations - USD ($)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011
Operating expenses:
Formation costs	$ 0	$ 0	$ 15,643
General and administrative	23,585	20,509	96,209
Operating loss	(23,585)	(20,509)	(111,852)
Interest expense	3,600	1,886	6,324
Net loss	$ (27,185)	$ (22,395)	$ (118,176)
Net loss per basic and diluted common share (in dollars per share)	$ (0.01)	$ (0.00)	$ (0.02)
Weighted-average number of common shares outstanding (in shares)	5,000,000	5,000,000	4,907,039

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

Statements of Stockholders' Equity (Deficit) - USD ($)	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Total
Balance at Nov. 16, 2007	$ 0	$ 0	$ 0	$ 0
Issuance of common stock on December 14, 2007 at $0.01 per share	$ 500	49,500	0	50,000
Issuance of common stock on December 14, 2007 at $0.01 per share (in shares)	5,000,000
Balance (in shares) at Nov. 16, 2007	0
Net loss	$ 0	0	(14,977)	(14,977)
Balance at Dec. 31, 2007	$ 500	49,500	(14,977)	35,023
Balance (in shares) at Dec. 31, 2007	5,000,000
Balance at Nov. 16, 2007	$ 0	0	0	0
Balance (in shares) at Nov. 16, 2007	0
Net loss				(118,176)
Balance at Dec. 31, 2011	$ 500	49,500	(118,176)	(68,176)
Balance (in shares) at Dec. 31, 2011	5,000,000
Balance at Dec. 31, 2007	$ 500	49,500	(14,977)	35,023
Balance (in shares) at Dec. 31, 2007	5,000,000
Net loss	$ 0	0	(33,623)	(33,623)
Balance at Dec. 31, 2008	$ 500	49,500	(48,600)	1,400
Balance (in shares) at Dec. 31, 2008	5,000,000
Net loss	$ 0	0	(19,996)	(19,996)
Balance at Dec. 31, 2009	$ 500	49,500	(68,596)	(18,596)
Balance (in shares) at Dec. 31, 2009	5,000,000
Net loss	$ 0	0	(22,395)	(22,395)
Balance at Dec. 31, 2010	$ 500	49,500	(90,991)	(40,991)
Balance (in shares) at Dec. 31, 2010	5,000,000
Net loss	$ 0	0	(27,185)	(27,185)
Balance at Dec. 31, 2011	$ 500	$ 49,500	$ (118,176)	$ (68,176)
Balance (in shares) at Dec. 31, 2011	5,000,000

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Statements of Cash Flows - USD ($)	12 Months Ended		49 Months Ended
Statements of Cash Flows - USD ($)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011
Operating activities
Net loss	$ (27,185)	$ (22,395)	$ (118,176)
Adjustments to reconcile net loss to net cash used in operating activities:
Increase in prepaid expenses	0	(625)	(2,500)
Increase in accounts payable	812	1,890	2,977
Increase in accrued interest	3,600	1,886	6,324
Increase in accrued expenses	0	0	5,500
Net cash used in operating activities	(22,773)	(19,244)	(105,875)
Financing activities
Proceeds from notes payable, stockholders	0	35,000	70,000
Payments on notes payable, stockholders	0	0	(10,000)
Proceeds from issuance of common stock	0	0	50,000
Net cash provided by financing activities	0	35,000	110,000
Net increase (decrease) in cash and cash equivalents	(22,773)	15,756	4,125
Cash and cash equivalents at beginning of period	26,898	11,142	0
Cash and cash equivalents at end of period	$ 4,125	$ 26,898	$ 4,125

Nature of Operations and Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Organization, Consolidation and Presentation Of Financial Statements [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block]

1.	Nature of Operations and Significant Accounting Policies

Nature of Operations

Zeta Acquisition Corp. II (the "Company") was incorporated under the laws of the State of Delaware on November 16, 2007. The Company is a new enterprise in the development stage as defined by Accounting Standards Codification ("ASC") Topic 915, Development Stage Entities. The Company was organized as a vehicle to investigate and, if such investigation warrants, acquire a target company or business seeking the perceived advantages of being a publicly held corporation. The Company's principal business objective for the next twelve (12) months and beyond will be to achieve long-term growth potential through a combination with a business. The Company will not restrict its potential candidate target companies to any specific business, industry or geographical location and, thus, may acquire any type of business.

Liquidity

Since its inception, the Company has generated no revenues and has incurred a net loss of $118,176. Since inception, the Company has been dependent upon the receipt of capital investment or other financing to fund its continuing activities. The Company has not identified any business combination and therefore, cannot ascertain with any degree of certainty the capital requirements for any particular transaction. In addition, the Company is dependent upon certain related parties to provide continued funding and capital resources. Subsequent to December 31, 2011, the Company received loans of $25,000 to fund operations (Note 7). The accompanying financial statements have been presented on the basis of the continuation of the Company as a going concern and do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might be necessary should the Company be unable to continue as a going concern.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates.

Cash and Cash Equivalents

For purposes of the statement of cash flows, the Company considers all highly liquid investments with a maturity of three (3) months or less to be cash equivalents.

Income Taxes

The Company accounts for income taxes in accordance with ASC Topic 740, Income Taxes, which requires the recognition of deferred tax liabilities and assets at currently enacted tax rates for the expected future tax consequences of events that have been included in the financial statements or tax returns. A valuation allowance is recognized to reduce the net deferred tax asset to an amount that is more likely than not to be realized.

Fair Value of Financial Instruments

Pursuant to ASC Topic 820-10, Fair Value Measurements and Disclosures, the Company is required to estimate the fair value of all financial instruments included on its balance sheet as of December 31, 2011 and 2010. The Company considers the carrying value of cash and cash equivalents, prepaid expenses, accounts payable, accrued expenses, and notes payable to stockholders to approximate fair value due to their short maturities.

Net Loss Per Share

Basic loss per share is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. The Company currently has no dilutive securities and as such, basic and diluted loss per share are the same for all periods presented.

Recently Issued Accounting Pronouncements

Management does not believe that any recently issued, but not yet effective, accounting standards, if currently adopted, would have a material effect.

Reclassifications

Certain amounts in the 2010 financial statements have been reclassified to conform to the current year presentation.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

+ References + Details

Income Taxes

12 Months Ended

Dec. 31, 2011

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

5.	Income Taxes

The Company has reviewed its tax positions as of December 31, 2011 and 2010, and has not identified any positions that are uncertain. Income tax returns filed and to be filed for the years ended December 31, 2009, 2010, and 2011 are open to review by the Internal Revenue Service.

The tax effects of temporary differences that give rise to significant portions of the Company's net deferred tax asset at December 31, 2011 and 2010 are as follows:

	December 31,			December 31,
	2011			2010
Deferred tax asset:
Capitalized formation costs	$	38,000		$	13,200
Net operating loss carryforward		2,200			400
Valuation allowance		(40,200	)		(13,600	)
Net deferred tax asset recognized	$	—		$	—

A full valuation allowance has been recorded against the Company's deferred tax asset because, based on the weight of available evidence, it is more likely than not that such benefits will not be realized. As of December 31, 2011, the Company has a net operating loss carryforward for federal and state income tax purposes of approximately $6,300. The net operating loss carryforward will begin to expire in 2029.

The benefit from income taxes differs from the amount computed by applying the United States (US) federal income tax rate of thirty-four percent (34%) in 2011 and fifteen percent (15%) in 2010 to loss before income taxes for the years ended December 31, 2011 and 2010 as follows:

	Year Ended			Year Ended
	December 31,			December 31,
	2011			2010

US federal income tax benefit at statutory rate	$	(9,200	)	$	(3,300	)
Change in expected effective tax rate from 15% to 34%		(17,400	)		—
Change in valuation allowance		26,600			3,300
Benefit from income taxes	$	—		$	—

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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+ Details

Statements of Stockholders' Equity (Deficit) [Parenthetical]	1 Months Ended
	Dec. 31, 2007 $ / shares
Issuance of common stock, value per share (in dollars per share)	$ 0.01