Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurement

The following tables represent the financial instruments measured at fair value on a recurring basis on the financial statements of the Company and the valuation approach applied to each class of financial instruments at June 30, 2016 and December 31, 2015.

	June 30, 2016
	(in thousands)
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash and cash equivalents	$	36,121	$	1,398	$	—	$	37,519
Investments:
Certificates of deposit	6,028		—		—		6,028
US Treasury securities	15,822		—		—		15,822
US Agency securities	—		4,010		—		4,010
Commercial Paper	—		499		—		499
Asset-backed securities	—		7,095		—		7,095
Corporate notes and bonds	—		31,465		—		31,465
Total investments	21,850		43,069		—		64,919
Total assets measured at fair value	$	57,971	$	44,467	$	—	$	102,438

	December 31, 2015
	(in thousands)
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash and cash equivalents	$	120,585	$	—	$	—	$	120,585
Investments:
Asset-backed securities	—		2,507		—		2,507
Corporate notes and bonds	—		9,332		—		9,332
Total investments	—		11,839		—		11,839
Total assets measured at fair value	$	120,585	$	11,839	$	—	$	132,424