Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (21,683)	$ (20,217)	$ (32,227)	$ (79,185)	$ (142,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			1,193	1,453
Impairment charges	0	0	1,008	0
Share-based compensation			(6,490)	24,506
Change in fair value of warrants	52	(8,284)	(252)	(12,310)
Change in fair value of contingent consideration			1,237	53
Deferred income taxes			1	(735)
Non-cash operating lease expense			828	814
Other non-cash operating activities			(1,233)	189
Changes in assets and liabilities:
Receivables			3,331	(1,806)
Inventories			(1,413)	0
Prepaid and other current assets			(1,213)	(3,761)
Trade payables and accrued liabilities			(2,718)	577
Contract liabilities			2,046	8,384
Provision for contract losses, net			(934)	30,577
Other non-current assets and liabilities			(1,521)	(116)
Net cash used in operating activities			(38,357)	(31,360)
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures			(854)	(3,484)
Purchases of available-for-sale securities			(81,488)	(199,779)
Maturities of available-for-sale securities			116,500	40,800
Sales of available-for-sale securities			0	65,817
Net cash provided by (used in) investing activities			34,158	(96,646)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock under employee stock purchase plan			168	0
Proceeds from exercise of stock options			1,155	887
Other financing costs			0	(1,274)
Net cash provided by (used in) financing activities			1,323	(387)
Decrease in cash, cash equivalents and restricted cash			(2,876)	(128,393)
Cash, cash equivalents and restricted cash at the beginning of the period			47,874	191,581	191,581
Cash, cash equivalents and restricted cash at the end of the period	44,998	63,188	44,998	63,188	47,874
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	43,498	60,731	43,498	60,731	45,719
Short-term restricted cash	0	957	0	957	655
Long-term restricted cash	1,500	1,500	1,500	1,500	1,500
Total cash, cash equivalents and restricted cash	$ 44,998	$ 63,188	44,998	63,188	$ 47,874
Non-cash investing and financing activities:
Fair value of Project Warrants and Collaboration Warrants recognized in equity			139	9,428
Capital expenditures incurred but not yet paid			$ 1	$ 251