Consolidated Statements of Cash Flows (unaudited) - Reconciliation of Cash, Cash Equivalents and Restricted Cash and Supplemental Disclosure of Non-cash Investing and Financing Activities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of cash, cash equivalents, and restricted cash
Cash and cash equivalents	$ 1,247,581	$ 220,433	$ 60,344
Restricted cash	7,800	7,800	7,800
Total cash, cash equivalents, and restricted cash	1,255,381	228,233	68,144
Cash paid for interest	0	0	317
Cash paid for income taxes	201	109	1
Supplemental disclosures of non-cash investing and financing activities:
Purchase of property and equipment accrued and not yet paid	1,190	159	73
Deemed dividend to redeemable convertible preferred stockholders	0	0	64,149
Deferred offering costs not yet paid	0	426	0
Conversion of redeemable convertible preferred stock to common stock	$ 0	$ 809	$ 0