Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Financial Instruments

Schedule of assets and liabilities measures at fair value on a recurring basis

Below is a summary of assets and liabilities measured at fair value on a recurring basis (in thousands):

	As of December 31, 2016
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Cash and cash equivalents:
Money market funds	$	22,423	$	—	$	—	$	22,423
Available-for-sale securities:
Corporate debt securities		—		13,930		—		13,930
U.S. government-sponsored securities		—		1,001		—		1,001
Total assets	$	22,423	$	14,931	$	—	$	37,354

	As of December 31, 2015
	Quoted Prices in Active Markets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	62,004	$	—	$	—	$	62,004
Total assets	$	62,004	$	—	$	—	$	62,004