Cash, Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2017

Cash Cash Equivalents And Short Term Investments [Abstract]

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, 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
December 31, 2016
Cash and cash equivalents:
Cash	$	3,557	$	-	$	-		$	3,557
Money market funds		18,981		-		-			18,981
U.S. government agency securities		1,751		-		-			1,751
Total cash and cash equivalents		24,289		-		-			24,289
Marketable securities available-for-sale:
U.S. Treasuries		3,499		-		-			3,499
U.S. government agency securities		28,685		3		(2	)		28,686
Corporate debt securities		24,938		5		(2	)		24,941
Total marketable securities available-for-sale		57,122		8		(4	)		57,126
Total cash, cash equivalents and marketable securities	$	81,411	$	8	$	(4	)	$	81,415

Maturities of Marketable Securities Available-for-Sale

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

	December 31, 2017
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	165,350	$	165,270
Mature after one year through two years		-		-
	$	165,350	$	165,270

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details