Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net income (loss)	$ (113,169)	$ (39,915)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	4,409	1,516
Noncash lease expense	2,083	1,712
Stock-based compensation expense	15,348	12,876
Loss on disposal of property and equipment	0	55
Goodwill, Impairment Loss	19,462	0
Loss on disposal of lease assets	0	(1)
Amortization of deferred debt issuance costs	29	18
Changes in operating assets and liabilities:
Accounts receivable - related party	0	156
Prepaid expenses and other current assets	756	1,696
Other non-current assets	265	933
Accounts payable	(223)	556
Contract liabilities — related party	0	(4,805)
Operating lease liabilities	773	(1,571)
Accrued and other current and non-current liabilities	36	846
Net cash used in operating activities	(70,231)	(25,928)
Cash flows from investing activities
Purchases of property and equipment	(4,328)	(10,292)
Net cash provided by (used in) investing activities	(4,328)	(10,292)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	0	43,360
Proceeds from exercise of stock options	4	468
Proceeds from Employee Stock Purchase Plan	225	203
Taxes withheld and paid related to net share settlement of equity awards	(69)	(2,461)
Deferred issuance costs	0	(365)
Net cash provided by (used in) financing activities	160	41,205
Net change in cash, cash equivalents and restricted cash	(74,399)	4,985
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	183,257	282,679
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in accounts payable and accrued expenses	105	7,111
Operating right-of-use assets obtained in exchange for operating lease liabilities	$ 0	$ 2,343