Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

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 March 31, 2017, and December 31, 2016.

	March 31, 2017
	(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
Money market funds	$	5,808	$	—	$	—	$	5,808
Investments:
Certificates of deposit	—		8,238		—		8,238
US Treasury securities	7,040		—		—		7,040
US Agency securities	—		4,994		—		4,994
Asset-backed securities	—		5,525		—		5,525
Corporate notes and bonds	—		28,232		—		28,232
Total investments	$	7,040	$	46,989	$	—	$	54,029
Total assets measured at fair value	$	12,848	$	46,989	$	—	$	59,837

	December 31, 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:
Money market funds	$	10,970	$	—	$	—	$	10,970
Investments:
Certificates of deposit	—		7,257		—		7,257
US Treasury securities	8,544		—		—		8,544
US Agency securities	—		4,501		—		4,501
Asset-backed securities	—		5,557		—		5,557
Corporate notes and bonds	—		32,660		—		32,660
Total investments	8,544		49,975		—		58,519
Total assets measured at fair value	$	19,514	$	49,975	$	—	$	69,489