Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value of Financial Assets and Liabilities

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

	Fair Value Measurements as of December 31,
	2015 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	8,810	$	250	$	—	$	9,060
Marketable securities		—		82,187		—		82,187
Total Assets	$	8,810	$	82,437	$	—	$	91,247

	Fair Value Measurements as of December 31,
	2014 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents	$	10,012	$	—	$	—	$	10,012
Marketable securities		—		5,891		—		5,891
	$	10,012	$	5,891	$	—	$	15,903

Schedule of the fair value of available for sale marketable securities by type of security

	December 31, 2015
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gain		Loss		Value
Marketable securities:
Corporate debt securities	$	46,270	$	—	$	(125)	$	46,145
Commercial paper		9,789		—		—		9,789
Asset-backed securities		6,234		—		(14)		6,220
U.S. government agency debt securities		20,048		—		(15)		20,033
Total marketable securities	$	82,341	$	—	$	(154)	$	82,187

	December 31, 2014
			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gain		Loss		Value
Marketable securities:
Corporate debt securities	$	5,096	$	—	$	(6)	$	5,090
U.S. government agency debt securities		801		—		—		801
Total marketable securities	$	5,897	$	—	$	(6)	$	5,891