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Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

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, 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

		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