Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2013

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

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


	December 31, 2013 Fair Value Measurements
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds	$	6,934	$	6,934	$	—	$	—
U.S. government sponsored entity debt securities		121,290		—		121,290		—

Total	$	128,224	$	6,934	$	121,290	$	—

Liabilities:
Contingent consideration liability	$	1,570	$	—	$	—	$	1,570

Total	$	1,570	$	—	$	—	$	1,570


	December 31, 2012 Fair Value Measurements
	Total		Level 1		Level 2		Level 3
Assets:
Money market funds		15,839		15,839		—		—
U.S. government sponsored entity debt securities		57,449		—		57,449		—

Total	$	73,288	$	15,839	$	57,449	$	—

Schedule of Fair Value of Contingent Consideration Liability

From the acquisition date of October 1, 2013 through December 31, 2013, the recognized amount of the liability for contingent consideration increased by $0.1 million primarily as the result of the passage of time.


	Year ended December 31, 2013
Fair value on date of acquisition (October 1, 2013)	$	1,510
Change in fair value		60

Fair value at end of period	$	1,570

- 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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