Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of available-for-sale marketable securities and cash and cash equivalents

Available-for-sale marketable securities and cash and cash equivalents consist of the following (in thousands):

	December 31, 2019
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	34,726	$	—	$	—		$	34,726
Money market	35,160		—		—			35,160
Domestic corporate commercial paper	—		—		—			—
Total	$	69,886	$	—	$	—		$	69,886
Marketable securities:
Domestic corporate debt securities	$	41,229	$	3	$	(3	)	$	41,229
Domestic corporate commercial paper	24,900		5		—			24,905
Agency bonds	12,391		1		(3		)	12,389
US treasury bonds	12,492		—		—			12,492
Total	$	91,012	$	9	$	(6	)	$	91,015

	December 31, 2018
	Amortized Cost Value		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Cash and cash equivalents:
Cash	$	20,448	$	—	$	—		$	20,448
Money market	38,873		—		—			38,873
Domestic corporate commercial paper	—		—		—			—
Total	$	59,321	$	—	$	—		$	59,321
Marketable securities:
Domestic corporate debt securities	$	132,886	$	—	$	(530	)	$	132,356
Domestic corporate commercial paper	—		—		—			—
Agency bonds	45,009		—		(225		)	44,784
Total	$	177,895	$	—	$	(755	)	$	177,140