Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities
Net income (loss)	$ (63,284)	$ (17,920)
Adjustments to reconcile net loss to net cash used in operating activities:
Noncash lease expense	1,335	1,304
Depreciation and amortization expense	2,764	757
Stock-based compensation expense	9,788	8,685
Loss on disposal of property and equipment	0	18
Amortization of deferred debt issuance costs	28	18
Changes in operating assets and liabilities:
Accounts receivable - related party	0	185
Prepaid expenses and other current assets	186	1,280
Other non-current assets	177	408
Accounts payable	(1,624)	(1,186)
Contract liabilities — related party	0	(4,805)
Operating lease liabilities	1,618	(902)
Accrued and other current and non-current liabilities	19	1,558
Net cash used in operating activities	(48,993)	(10,600)
Cash flows from investing activities
Purchases of property and equipment	(3,422)	(5,481)
Net cash provided by (used in) investing activities	(3,422)	(5,481)
Cash flows from financing activities
Proceeds from Employee Stock Purchase Plan	225	203
Proceeds from exercise of stock options	4	277
Taxes withheld and paid related to net share settlement of equity awards	(10)	(1,106)
Deferred issuance costs	0	(345)
Net cash provided by (used in) financing activities	219	(971)
Net change in cash, cash equivalents and restricted cash	(52,196)	(17,052)
Cash, cash equivalents and restricted cash, at the beginning of period	257,656	277,694
Cash, cash equivalents and restricted cash, at the end of period	205,460	260,642
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	205,460
Cash, cash equivalents and restricted cash, at the end of period	205,460	260,642
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable	670	4,469
Operating right-of-use assets obtained in exchange for operating lease liabilities	$ 0	$ 2,343