Cash, Cash Equivalents, Restricted Cash and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2020

Cash Cash Equivalents And Short Term Investments [Abstract]

Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same amounts shown in the consolidated statements of cash flows:

	December 31
	2020		2019		2018
Cash and cash equivalents	$	32,073	$	39,884	$	49,348
Restricted cash		237		216		619
Total cash, cash equivalents and restricted cash shown in the    consolidated statements of cash flows	$	32,310	$	40,100	$	49,967

Summary of Cash, Cash Equivalents and Marketable Securities

Cash, cash equivalents and marketable securities consist of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
December 31, 2020
Cash and cash equivalents:
Cash	$	7,945	$	-	$	-		$	7,945
Money market funds		23,128		-		-			23,128
Corporate debt securities		1,000		-		-			1,000
Total cash and cash equivalents		32,073		-		-			32,073
Marketable securities available-for-sale:
U.S. treasuries		32,548		31		-			32,579
U.S. government agency securities		40,313		14		(6	)		40,321
Corporate debt securities		60,071		3		(11	)		60,063
Total marketable securities available-for-sale		132,932		48		(17	)		132,963
Total cash, cash equivalents and marketable securities	$	165,005	$	48	$	(17	)	$	165,036
December 31, 2019
Cash and cash equivalents:
Cash	$	4,038	$	-	$	-		$	4,038
Money market funds		27,854		-		-			27,854
Corporate debt securities		7,992		-		-			7,992
Total cash and cash equivalents		39,884		-		-			39,884
Marketable securities available-for-sale:
U.S. treasuries		6,511		6		-			6,517
U.S. government agency securities		51,235		50		(12	)		51,273
Corporate debt securities		53,353		28		-			53,381
Total marketable securities available-for-sale		111,099		84		(12	)		111,171
Total cash, cash equivalents and marketable securities	$	150,983	$	84	$	(12	)	$	151,055

Maturities of Marketable Securities Available-for-Sale

The maturities of our marketable securities available-for-sale are as follows (in thousands):

.	December 31, 2020
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	122,156	$	122,181
Mature after one year through two years		10,776		10,782
	$	132,932	$	132,963