Investments (Tables)

6 Months Ended

Jun. 30, 2017

Schedule of Investments [Abstract]

Summary of Investments

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

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss			Fair Value
Current:
Corporate debt securities	$	64,449	$	3	$	(79	)	$	64,373
Commercial paper		19,207		—		(3	)		19,204
U.S. government and agency securities		4,500		—		(4	)		4,496
Non-current:
Corporate debt securities (one to two year maturity)		34,816		12		(59	)		34,769
Certificates of deposit (one to two year maturity)		2,500		—		—			2,500
	$	125,472	$	15	$	(145	)	$	125,342

The following table summarizes the Company’s investments as of December 31, 2016 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss			Fair Value
Current:
Corporate debt securities	$	52,762	$	5	$	(45	)	$	52,722
Commercial paper		24,670		5		(7	)		24,668
U.S. government and agency securities		2,500		—		(1	)		2,499
Non-current:
Corporate debt securities (one to two year maturity)		43,546		29		(140	)		43,435
U.S. government and agency securities		2,000		—		(1	)		1,999
	$	125,478	$	39	$	(194	)	$	125,323