Fair Value Measurements (Tables)

9 Months Ended

Sep. 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 September 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):

	As of  September 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:
Cash equivalents:
Money market funds	$	9,957		—		—	$	9,957
U.S. treasury securities		—		2,498				2,498
U.S. government and agency securities		—		6,999		—		6,999
Short-term investments
U.S. treasury securities		—		7,289		—		7,289
U.S. government and agency securities		—		16,740		—		16,740
Total financial assets	$	9,957	$	33,526	$	—	$	43,483
Liabilities:
Contingent consideration		—		—	$	1,705	$	1,705
Total financial liabilities	$	—	$	—	$	1,705	$	1,705
	As of  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:
Cash equivalents
Money market funds	$	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		47
Contingent consideration from IDV acquisition		5,020
Payments made during the year		(3,750	)
Balance at September 30, 2017	$	1,705