Cash, Cash Equivalents, Restricted Cash and Marketable Securities

12 Months Ended

Dec. 31, 2018

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
	2018		2017		2016
Cash and cash equivalents	$	49,348	$	26,584	$	24,289
Restricted cash		619		629		602
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	$	49,967	$	27,213	$	24,891

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, 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
December 31, 2017
Cash and cash equivalents:
Cash	$	4,041	$	-	$	-		$	4,041
Money market funds		22,543		-		-			22,543
Total cash and cash equivalents		26,584		-		-			26,584
Marketable securities available-for-sale:
U.S. treasuries		45,559		-		(25	)		45,534
U.S. government agency securities		86,860		-		(40	)		86,820
Corporate debt securities		32,931		-		(15	)		32,916
Total marketable securities available-for-sale		165,350		-		(80	)		165,270
Total cash, cash equivalents and marketable securities	$	191,934	$	-	$	(80	)	$	191,854

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

.	December 31, 2018
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	96,256	$	96,188
Mature after one year through two years		-		-
	$	96,256	$	96,188

There were no realized gains or losses from the sale of marketable securities in the years ended December 31, 2018, 2017 and 2016. 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.