Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2021		December 31, 2020
Cash	$	135,729	$	122,312
Money market funds	233,344		96,116
Government-backed securities	54,250		44,250
Treasury securities	25,022		44,052
Corporate debt securities	1,547,137		246,668
Cash and cash equivalents	$	1,995,482	$	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):

	March 31, 2021		December 31, 2020
Cash and cash equivalents	$	1,995,482	$	553,398
Restricted cash current	32,128		93,880
Restricted cash non-current	1,460		1,460
Cash, cash equivalents and restricted cash	$	2,029,070	$	648,738