CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (30,330)	$ (33,554)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	775	791
Stock-based compensation expense	3,308	3,453
Loss on disposal of property and equipment, net	156	48
Other	6	25
Changes in assets and liabilities:
Accounts receivable, net	(3,611)	(334)
Unbilled receivables	(1,322)	(228)
Inventory	(579)	(2,494)
Prepaid expenses and other current assets	(324)	1,010
Due from related parties		48
Prepaid inventory	693	281
Other long term assets	(9)	142
Accounts payable	193	229
Deferred grant funding	(402)	(196)
Deferred revenue	97	(364)
Due to related parties	(8)	48
Accrued expenses and other current liabilities	949	(776)
Operating lease liabilities, net	(2)
Net cash used in operating activities	(30,410)	(31,871)
Cash flows from investing activities:
Purchases of property and equipment	(375)	(546)
Net cash used in investing activities	(375)	(546)
Cash flows from financing activities:
Proceeds from exercise of stock options	160	146
Proceeds from shares issued under "at-the-market" offering program, net of selling costs	805
Net cash provided by financing activities	965	146
Net decrease in cash and cash equivalents and restricted cash	(29,820)	(32,271)
Cash, cash equivalents and restricted cash, beginning of period	75,804	118,243
Cash, cash equivalents and restricted cash, end of period	45,984	85,972
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets
Cash and cash equivalents	45,765	85,424
Restricted cash	219	548
Total cash, cash equivalents and restricted cash	45,984	85,972
Supplemental disclosure of noncash information:
Unpaid purchase of property and equipment	$ 571	$ 54