Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Financial Instruments (Excluding Restricted Cash) Measured at Fair Value on Recurring Basis

The following tables set forth the Company’s financial instruments (excluding restricted cash) that were measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):

	December 31, 2019
	Total		Level 1		Level 2		Level 3
Money market funds	$	45,498	$	45,498	$	-	$	-
U.S. government agency obligations		74,854		-		74,854		-
Corporate securities and commercial paper		67,918		-		67,918		-
Total assets measured at fair value	$	188,270	$	45,498	$	142,772	$	-

	December 31, 2018
	Total		Level 1		Level 2		Level 3
Money market funds	$	45,017	$	45,017	$	-	$	-
U.S. government agency obligations		103,940		-		103,940		-
Corporate securities and commercial paper		110,768		-		110,768		-
Total assets measured at fair value	$	259,725	$	45,017	$	214,708	$	-

Schedule of Investments Classified as Available for Sale Securities with Contractual Maturities

Classified as (with contractual maturities):

	Year Ended December 31,
	2019		2018
Cash and cash equivalents	$	57,937	$	71,064
Short-term investments (due within one year)		130,333		185,480
Long-term investments (due between one and two    years)		-		3,181
	$	188,270	$	259,725

Schedule of Fair Value and Amortized Cost of Investments in Marketable Securities by Major Security Type

The fair value and amortized cost of investments in marketable securities by major security type as of December 31, 2019 and 2018 are presented in the tables that follow (in thousands):

	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value
As of December 31, 2019:
Money market funds	$	45,498	$	-	$	-		$	45,498
U.S. government agency obligations		74,801		12		(1	)		74,812
Corporate securities and commercial paper		67,907		55		(2	)		67,960
Total	$	188,206	$	67	$	(3	)	$	188,270

	Amortized Cost		Unrealized Gain		Unrealized Loss			Fair Value
As of December 31, 2018:
Money market funds	$	45,017	$	-	$	-		$	45,017
U.S. government agency obligations		103,957		-		(17	)		103,940
Corporate securities and commercial paper		110,859		-		(91	)		110,768
Total	$	259,833	$	-	$	(108	)	$	259,725