Condensed Combined Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net loss	$ (80,481)	$ (37,427)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	15,298	480
Unrealized (gains) losses on equity securities	(8,834)	202
Non-cash interest items, net (including amounts with related parties)	3,435	1,965
Depreciation and amortization	2,972	3,461
Non-cash lease expense related to operating lease right-of-use assets	1,555	1,177
Amortization of net premiums and discounts on marketable debt securities	225	45
Deferred tax	0	(1,067)
Other	(125)	4
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(934)	(4,020)
Other assets	693	322
Accounts payable	6,497	(1,724)
Accrued expenses and other liabilities	(1,893)	8,228
Related parties	2,597	(2,411)
Operating lease liabilities	(1,474)	(342)
Net cash used in operating activities	(60,469)	(31,107)
Investing activities:
Purchases of property, plant and equipment	(7,083)	(315)
Purchases of marketable debt securities, available-for-sale	(91)	(10,300)
Maturities of marketable debt securities	31,925	23,109
Proceeds from sales of marketable debt securities	7,094	1,500
Net cash provided by investing activities	31,845	13,994
Financing activities:
Proceeds from issuance of related-party promissory notes	40,000	0
Proceeds from exercises of stock options	1,121	0
Net share settlement for RSUs vesting	(2,624)	(123)
Net cash provided by (used in) financing activities	38,497	(123)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(109)	89
Net change in cash, cash equivalents, and restricted cash	9,764	(17,147)
Cash, cash equivalents, and restricted cash, beginning of period	35,094	75,980
Cash, cash equivalents, and restricted cash, end of period	44,858	58,833
Reconciliation of cash, cash equivalents, and restricted cash, end of period:
Cash and cash equivalents	44,679	58,654
Restricted cash (Note 3)	179	179
Cash, cash equivalents, and restricted cash, end of period	44,858	58,833
Supplemental disclosure of cash flow information:
Interest	12	7
Income taxes	2	0
Supplemental disclosure of non-cash activities:
Property and equipment purchases included in accounts payable, accrued expenses, and due to related parties	(4,267)	(367)
Right-of-use assets obtained in exchange for operating lease liabilities	1,388	0
Unrealized gains on marketable debt securities	$ 14	$ 23