Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Financial Instruments

Summary of assets measured at fair value on a recurring basis

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

	As of September 30, 2018
	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	$	9,427	$	—	$	—	$	9,427
Corporate debt securities	—		1,244		—		1,244
U.S reverse repurchase agreements	—		3,000		—		3,000
Short-term investments:
Corporate debt securities	—		10,363		—		10,363
U.S reverse repurchase agreements	—		13,000		—		13,000
Total assets	$	9,427	$	27,607	$	—	$	37,034

	As of December 31, 2017
	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	$	13,588	$	—	$	—	$	13,588
Total assets	$	13,588	$	—	$	—	$	13,588