Fair Value of Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value of Financial Assets and Liabilities

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

	September 30, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	24,583	$	—	$	—	$	24,583
Marketable securities		—		107,681		—		107,681
Total Assets	$	24,583	$	107,681	$	—	$	132,264
Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	5,244	$	5,244
Total liabilities	$	—	$	—	$	5,244	$	5,244

	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	19,339	$	—	$	—	$	19,339
Marketable securities		—		188,652		—		188,652
Total Assets	$	19,339	$	188,652	$	—	$	207,991
Liabilities:
Acquisition-related contingent consideration	$	—	$	—	$	4,378	$	4,378
Total liabilities	$	—	$	—	$	4,378	$	4,378

Schedule of the fair value of available for sale marketable securities

	September 30, 2018
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gain		Loss		Value
Marketable securities:
Corporate debt securities	$	16,088	$	—	$	(23)	$	16,065
Commercial paper		51,691		—		—		51,691
Asset-backed securities		16,009		—		(8)		16,001
U.S. government agency debt securities		23,952		—		(28)		23,924
Total marketable securities	$	107,740	$	—	$	(59)	$	107,681

	December 31, 2017
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gain		Loss		Value
Marketable securities:
Corporate debt securities	$	37,401	$	—	$	(68)	$	37,333
Commercial paper		85,202		—		—		85,202
Asset-backed securities		16,708		—		(13)		16,695
U.S. government agency debt securities		49,511		—		(89)		49,422
Total marketable securities	$	188,822	$	—	$	(170)	$	188,652