Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Company's available-for-sale investments

The following table summarizes the Company’s marketable securities as of June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate notes and bonds	$	16,603	$	—	$	(12	)	$	16,591
U.S. government and agency securities	1,501		—		(1		)	1,500
Commercial paper	—		—		—			—
Total	$	18,104	$	—	$	(13	)	$	18,091
December 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate notes and bonds	$	18,846	$	—	$	(25	)	$	18,821
U.S. government and agency securities	3,506		—		(3		)	3,503
Commercial paper	3,283		—		—			3,283
Total	$	25,635	$	—	$	(28	)	$	25,607

Company's available-for-sale maturities investments

The following table summarizes the maturities of the Company’s marketable securities as of June 30, 2017 (in thousands):

	Amortized Cost		Estimated Fair Value
Due in one year or less	$	18,104	$	18,091
Due after one year through two years	—		—
Total	$	18,104	$	18,091