CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (9,848)	$ (12,160)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	263	254
Stock-based compensation expense	1,032	1,126
Payments received on net investment in lease	34	2
Changes in assets and liabilities:
Accounts receivable, net	(2,154)	(915)
Unbilled receivables	47	(259)
Inventory	(833)	(1,122)
Prepaid expenses and other current assets	(1,252)	272
Due from related parties		48
Prepaid inventory	693	281
Other long term assets	200	(18)
Accounts payable	1,208	954
Deferred grant funding	(621)	(58)
Deferred revenue	127	(125)
Due to related parties	(16)	64
Accrued expenses and other current liabilities	(1,392)	(1,835)
Operating lease liabilities, net	2
Net cash used in operating activities	(12,510)	(13,491)
Cash flows from investing activities:
Purchases of property and equipment	(145)	(61)
Net cash used in investing activities	(145)	(61)
Cash flows from financing activities:
Proceeds from exercise of stock options	55	49
Net cash provided by financing activities	55	49
Net decrease in cash and cash equivalents and restricted cash	(12,600)	(13,503)
Cash, cash equivalents and restricted cash, beginning of period	75,804	118,243
Cash, cash equivalents and restricted cash, end of period	63,204	104,740
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets
Cash and cash equivalents	63,204	104,027
Restricted cash		713
Total cash, cash equivalents and restricted cash	63,204	104,740
Supplemental disclosure of noncash information:
Unpaid purchase of property and equipment	$ 742	$ 36