Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Name Emerging Issues Task Force (EITF)

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-Paragraph 4

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-Publisher FASB

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-Glossary Diluted Earnings Per Share

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-Name Accounting Standards Codification

-Glossary Antidilution

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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+ Details

- Definition

Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

- Definition

This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

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+ Details

Significant Accounting and Reporting Policies (Additional Information) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		22 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	33,778,695	1,380,800	28,130,042
Commercial paper classified as cash and cash equivalents	$ 740		$ 740	$ 0
Short-term investments	3,120		3,120	0
Vested and Unvested Stock Option [Member]
Significant Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	11,583,888	0	11,583,888
Maximum [Member] \| Vested and Unvested Stock Option [Member]
Significant Accounting Policies [Line Items]
Stock Option Exercise Price	$ 5.50
Minimum [Member] \| Vested and Unvested Stock Option [Member]
Significant Accounting Policies [Line Items]
Stock Option Exercise Price	$ 0.96
Corporate Paper [Member]
Significant Accounting Policies [Line Items]
Short-term investments	$ 3,120		$ 3,120	$ 0