Cash and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2019

Investments, Debt and Equity Securities [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 amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):

	September 30, 2019		December 31, 2018		September 30, 2018		December 31, 2017
Cash and cash equivalents	$	114,291	$	140,418	$	39,298	$	49,826
Restricted cash included in Restricted cash, current portion	2,000		—		—		—
Restricted cash included in Non-current restricted cash	1,500		3,500		79,941		3,500
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows	$	117,791	$	143,918	$	119,239	$	53,326

Restrictions on Cash and Cash Equivalents

A reconciliation of cash, cash equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets to the amounts reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):

	September 30, 2019		December 31, 2018		September 30, 2018		December 31, 2017
Cash and cash equivalents	$	114,291	$	140,418	$	39,298	$	49,826
Restricted cash included in Restricted cash, current portion	2,000		—		—		—
Restricted cash included in Non-current restricted cash	1,500		3,500		79,941		3,500
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows	$	117,791	$	143,918	$	119,239	$	53,326

Marketable Securities

The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Estimated Fair Value
September 30, 2019
Assets
Cash equivalents:
Money market funds	$	77,213	$	—	$	—		$	77,213
Total	77,213		—		—			77,213
Available-for-sale securities:
Commercial paper securities	180,590		224		(2		)	180,812
Corporate debt securities	70,947		167		—			71,114
U.S. government-sponsored entity debt securities	41,394		30		—			41,424
Total	292,931		421		(2		)	293,350
Total cash equivalents and available-for-sale securities	$	370,144	$	421	$	(2	)	$	370,563
December 31, 2018
Assets
Cash equivalents:
Money market funds	$	103,291	$	—	$	—		$	103,291
Total	103,291		—		—			103,291
Available-for-sale securities:
Commercial paper securities	177,353		—		(129		)	177,224
Corporate debt securities	63,981		—		(111		)	63,870
U.S. government-sponsored entity debt securities	18,640		—		(19		)	18,621
Total	259,974		—		(259		)	259,715
Total cash equivalents and available-for-sale securities	$	363,265	$	—	$	(259	)	$	363,006

Fair value of investments available-for-sale

The fair value of investments available-for-sale by contractual maturity were as follows (in thousands):

	September 30, 2019		December 31, 2018
Maturing in one year or less	$	240,561	$	259,715
Maturing after one year through five years	52,789		—
Total	$	293,350	$	259,715