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Fair value measurement (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of financial assets and financial liabilities that are measured at fair value on a recurring basis

At December 31, 2012	Level 1		Level 2		Total

Assets:
Cash equivalents	$	39,001	$	2,460	$	41,461
Marketable securities		—		41,558		41,558
Restricted cash		30		—		30

Total assets	$	39,031	$	44,018	$	83,049

At December 31, 2011	Level 1		Level 2		Total

Assets:
Cash equivalents	$	81,082	$	—	$	81,082
Restricted cash		465		—		465

Total assets	$	81,547	$	—	$	81,547

Schedule of reconciliation between the beginning and ending balances of preferred stock warrants that used significant unobservable inputs


Balance at December 31, 2010	$	140
Increase in the fair value of the liability		132
Exercise and conversion of preferred stock warrants into common stock		(272	)

Balance at December 31, 2011	$	—

- Definition

Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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