Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Schedule of cash and cash equivalents

Cash and cash equivalents consist of highly liquid investments with maturities of three months or less from the date of purchase. Cash and cash equivalents consist of the following at (in thousands):

	September 30, 2021		December 31, 2020
Cash	$	113,781	$	122,312
Money market funds	366,242		96,116
Government-backed securities	197,250		44,250
Treasury securities	99,996		44,052
Corporate debt securities	1,159,729		246,668
Cash and cash equivalents	$	1,936,998	$	553,398

Schedule of reconciliation of cash, cash equivalents and restricted cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the consolidated balance sheets that sum to the total of the same such amounts shown in the statement of cash flows (in thousands):

	September 30, 2021		December 31, 2020
Cash and cash equivalents	$	1,936,998	$	553,398
Restricted cash current	8,175		93,880
Restricted cash non-current	1,653		1,460
Cash, cash equivalents and restricted cash	$	1,946,826	$	648,738