Cash and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2020

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents

A reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amount reported within the Condensed Consolidated Statements of Cash Flows is shown in the table below (in thousands):

	June 30,		December 31,		June 30,		December 31,
	2020		2019		2019		2018
Cash and cash equivalents	$	137,184	$	79,449	$	62,936	$	77,123
Restricted cash included within other non-current assets	1,500		1,500		1,500		1,500
Total cash, cash equivalents, and restricted cash	$	138,684	$	80,949	$	64,436	$	78,623

Schedule of Restricted Cash and Cash Equivalents

A reconciliation of cash, cash equivalents, and restricted cash reported within the Condensed Consolidated Balance Sheets to the amount reported within the Condensed Consolidated Statements of Cash Flows is shown in the table below (in thousands):

	June 30,		December 31,		June 30,		December 31,
	2020		2019		2019		2018
Cash and cash equivalents	$	137,184	$	79,449	$	62,936	$	77,123
Restricted cash included within other non-current assets	1,500		1,500		1,500		1,500
Total cash, cash equivalents, and restricted cash	$	138,684	$	80,949	$	64,436	$	78,623

Summary of Available for Sale Securities

The amortized cost, gross unrealized holding gains or losses, and fair value of the Company’s marketable securities by major security type at each balance sheet date are summarized in the tables below (in thousands):

	June 30, 2020
	Amortized Cost		Unrealized Holding Gains		Unrealized Holding Losses		Aggregate Fair Value
Short-term marketable securities:
U.S. government treasuries(1)	$	332,659	$	553	$	—	$	333,212
Corporate debt securities	49,458		303		—		49,761
Commercial paper	29,424		—		—		29,424
Total short-term marketable securities	411,541		856		—		412,397
Long-term marketable securities:
Corporate debt securities	7,127		102		—		7,229
Total long-term marketable securities	7,127		102		—		7,229
Total	$	418,668	$	958	$	—	$	419,626

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(1)Immaterial unrealized holding losses on 4 securities.

	December 31, 2019
	Amortized Cost		Unrealized Holding Gains		Unrealized Holding Losses		Aggregate Fair Value
Short-term marketable securities:
U.S. government treasuries(1)	$	249,478	$	594	$	(2)	$	250,070
U.S. government agency securities	1,999		1		—		2,000
Corporate debt securities(2)	53,396		94		(11)		53,479
Commercial paper	30,358		—		—		30,358
Total short-term marketable securities	335,231		689		(13)		335,907
Long-term marketable securities:
U.S. government treasuries(3)	13,865		6		(2)		13,869
Corporate debt securities(4)	25,998		34		(15)		26,017
Total long-term marketable securities	39,863		40		(17)		39,886
Total	$	375,094	$	729	$	(30)	$	375,793

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(1)Unrealized holding losses on 2 securities with an aggregate fair value of $9.3 million.

(2)Unrealized holding losses on 4 securities with an aggregate fair value of $25.9 million.

(3)Unrealized holding losses on 1 security with an aggregate fair value of $10.1 million.

(4)Unrealized holding losses on 3 securities with an aggregate fair value of $17.2 million.