Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

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

Assets and liabilities measured at fair value on a recurring basis are summarized below (in thousands):

	Balance as of December 31, 2013
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	3,357	$	3,357	$	—	$	—
Liabilities:
Series D redeemable convertible preferred stock warrants	$	126	$	—	$	—	$	126

	Balance as of March 31, 2014
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	2,438	$	2,438	$	—	$	—
Liabilities:
Series D redeemable convertible preferred stock warrants	$	814	$	—	$	—	$	814

Schedule of the changes in the Company's Level 3 instruments measured at fair value on a recurring basis

The following table presents the changes in the Company’s Level 3 instruments measured at fair value on a recurring basis (in thousands):

	Series D Warrants
Balance as of December 31, 2013	$	126
Change in fair value of warrant liability	688
Balance as of March 31, 2014	$	814

- 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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