Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis at June 30, 2017 and December 31, 2016 by level within the fair value hierarchy. Financial assets and financial liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement (in thousands):

	At June 30, 2017
	Quoted		Significant
	Prices in		Other		Significant
	Active		Observable		Unobservable
	Markets		Inputs		Inputs		Total Fair
	(Level 1)		(Level 2)		(Level 3)		Value
	(in thousands)
Assets:
Money market funds (included in cash and cash    equivalents)	$	29,724		—		—	$	29,724
U.S. treasury securities		—		11,276		—	$	11,276
U.S. government agency obligations		—		1,159		—	$	1,159
Total financial assets	$	29,724	$	12,435	$	—	$	42,159
Liabilities:
Contingent consideration		—		—	$	5,440	$	5,440
Total financial liabilities	$	—	$	—	$	5,440	$	5,440
	At December 31, 2016
	Quoted		Significant
	Prices in		Other		Significant
	Active		Observable		Unobservable
	Markets		Inputs		Inputs		Total Fair
	(Level 1)		(Level 2)		(Level 3)		Value
	(in thousands)
Assets:
Money market funds (included in cash and cash    equivalents)	$	57,032		—		—	$	57,032
Total financial assets	$	57,032	$	—	$	—	$	57,032
Liabilities:
Contingent consideration		—		—	$	388	$	388
Total financial liabilities	$	—	$	—	$	388	$	388

Summary of Changes in Level 3 Financial Instruments

The following table summarizes the changes in Level 3 financial instruments (in thousands).

	Amount
Fair Value at December 31, 2016	$	388
Foreign currency translation		32
Contingent consideration from IDV acquisition		5,020
Balance at June 30, 2017	$	5,440