Cash, Cash Equivalents, Restricted Cash and Marketable Securities

12 Months Ended

Dec. 31, 2019

Investments Debt And Equity Securities [Abstract]

Cash, Cash Equivalents, Restricted Cash and Marketable Securities

4.	Cash, Cash Equivalents, Restricted Cash and Marketable Securities

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
	2019		2018		2017
Cash and cash equivalents	$	39,884	$	49,348	$	26,584
Restricted cash		216		619		629
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	$	40,100	$	49,967	$	27,213

Restricted cash balances relate to certificates of deposit issued as collateral to certain letters of credit issued as security to our lease arrangements. See Note 9.

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

	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
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
December 31, 2018
Cash and cash equivalents:
Cash	$	3,147	$	-	$	-		$	3,147
Money market funds		44,002		-		-			44,002
Corporate debt securities		2,199		-		-			2,199
Total cash and cash equivalents		49,348		-		-			49,348
Marketable securities available-for-sale:
U.S. treasuries		14,732		-		(8	)		14,724
U.S. government agency securities		42,416		-		(44	)		42,372
Corporate debt securities		39,108		-		(16	)		39,092
Total marketable securities available-for-sale		96,256		-		(68	)		96,188
Total cash, cash equivalents and marketable securities	$	145,604	$	-	$	(68	)	$	145,536

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

.	December 31, 2019
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	97,585	$	97,662
Mature after one year through two years		13,514		13,509
	$	111,099	$	111,171

There were no realized gains or losses from the sale of marketable securities in the years ended December 31, 2019, 2018 and 2017. All of our investments are classified as short-term and available-for-sale, as we consider them available to fund current operations and may not hold our investments until maturity.