CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net loss	$ (33,554)	$ (60,105)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	791	754
Stock-based compensation expense	3,453	8,859
Loss on disposal of property and equipment, net	48
Payments received on net investment in lease	25	6
Changes in assets and liabilities:
Accounts receivable, net	(334)	(2,149)
Unbilled receivables	(228)	(1,384)
Inventory	(2,494)	308
Prepaid expenses and other current assets	1,010	(439)
Due from related parties	48	14
Prepaid inventory	281
Other long term assets	142	62
Accounts payable	229	(1,522)
Deferred grant funding	(196)	(1,403)
Deferred revenue	(364)	1,098
Due to related parties	48	(1,920)
Accrued expenses and other current liabilities	(776)	827
Net cash used in operating activities	(31,871)	(56,994)
Cash flows from investing activities:
Purchases of property and equipment	(546)	(427)
Net cash used in investing activities	(546)	(427)
Cash flows from financing activities:
Proceeds from exercise of stock options	146	2
Net cash provided by financing activities	146	2
Net decrease in cash and cash equivalents and restricted cash	(32,271)	(57,419)
Cash, cash equivalents and restricted cash, beginning of period	118,243	191,160
Cash, cash equivalents and restricted cash, end of period	85,972	133,741
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets
Cash and cash equivalents	85,424	132,482
Restricted cash	548	1,259
Total cash, cash equivalents and restricted cash	85,972	133,741
Supplemental disclosure of noncash information:
Noncash acquisition of fixed assets	$ 54
Write-off of notes receivable		$ 90