Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 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 December 31, 2016, and 2015 (see Note 2, Summary of Significant Accounting Policies for further information):

	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

	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:
Money market funds	$	5,221	$	—	$	—	$	5,221
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	$	5,221	$	11,839	$	—	$	17,060