Marketable Securities and Fair Value of Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Marketable Securities by Type

Marketable securities by security type consisted of the following (in thousands):

	September 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. Treasury bills (due within one year)	$	—	$	—	$	—	$	—
	$	—	$	—	$	—	$	—

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury bills and notes (due within one year)	$	22,935	$	—	$	(12	)	$	22,923
	$	22,935	$	—	$	(12	)	$	22,923

Schedule of Assets Measured at Fair Value on Recurring Basis

The following tables present information about the Company’s assets that are measured at fair value on a recurring basis (in thousands):

	Fair Value Measurements at September 30, 2019 Using:
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	—	$	484	$	—	$	484
Marketable securities:
U.S. Treasury bills		—		—		—	$	—
	$	—	$	484	$	—	$	484

	Fair Value Measurements at December 31, 2018 Using:
	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market funds	$	—	$	52,100	$	—	$	52,100
Marketable securities:
U.S. Treasury bills and notes		22,923		—		—		22,923
	$	22,923	$	52,100	$	—	$	75,023