Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Securities and Contingent Consideration Liability

The fair value measurements of cash equivalents, available-for-sale securities and the contingent consideration liabilities are identified at the following levels within the fair value hierarchy (in thousands):

	December 31, 2014
	Fair Value Measurements
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents:
Money market funds	$	3,182	$	3,182	$	—	$	—
Total		3,182		3,182		—		—
Marketable securities:
Commercial paper securities		33,748		—		33,748		—
Corporate debt securities		22,813		—		22,813		—
U.S. government sponsored entity debt securities		163,631		—		163,631		—
Total		220,192		—		220,192		—
Total cash equivalents and marketable securities	$	223,374	$	3,182	$	220,192	$	—
Liabilities:
Contingent consideration liability	$	1,800	$	—	$	—	$	1,800
Total	$	1,800	$	—	$	—	$	1,800

	December 31, 2013
	Fair Value Measurements
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents:
Money market funds	$	6,934	$	6,934	$	—	$	—
Total		6,934		6,934		—		—
Marketable securities:
U.S. government sponsored entity debt securities		121,290		—		121,290		—
Total cash equivalents and marketable securities	$	128,224	$	6,934	$	121,290	$	—
Liabilities:
Contingent consideration liability	$	1,570	$	—	$	—	$	1,570
Total	$	1,570	$	—	$	—	$	1,570

Schedule of Changes in Estimated Fair Value of Contingent Consideration Liability

The following sets forth the changes in the estimated fair value for our contingent consideration liability classified as Level 3 (in thousands):

Fair value as of December 31, 2013	$	1,570
Change in fair value		230
Fair value as of December 31, 2014	$	1,800

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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- 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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