Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 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 March 31, 2016 and December 31, 2015.

	March 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 Equivalents:
Certificates of deposit	$	441	$	—	$	—	$	441
Money market funds	39,328		—		—		39,328
Investments:
Certificates of deposit	4,110		—		—		4,110
US Treasury securities	14,609		—		—		14,609
US Agency securities	—		4,503		—		4,503
Corporate notes, bonds and commercial paper	—		15,322		—		15,322
Asset-backed securities	—		6,086		—		6,086
Total assets measured at fair value	$	58,488	$	25,911	$	—	$	84,399

	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 Equivalents:
Money market funds	$	5,221	$	—	$	—	$	5,221
Investments:
Corporate notes and bonds	—		9,332		—		9,332
Asset-backed securities	—		2,507		—		2,507
Total assets measured at fair value	$	5,221	$	11,839	$	—	$	17,060