CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 85,424	$ 117,472
Restricted cash	548	771
Accounts receivable, less allowance of $241 and $180 as of September 30, 2023 and December 31, 2022, respectively	2,437	2,103
Unbilled receivables	682	454
Inventory	6,940	4,622
Prepaid expenses and other current assets	2,184	3,194
Total current assets	98,215	128,664
Property and equipment, net	3,158	3,248
Other long term assets	1,691	2,139
Total assets	103,064	134,051
CURRENT LIABILITIES:
Accounts payable	908	678
Deferred grant funding	548	771
Deferred revenue	1,454	1,378
Accrued expenses and other current liabilities	5,253	5,976
Total current liabilities	8,211	8,803
Long term deferred revenue	1,086	1,526
Total liabilities	9,297	10,329
COMMITMENTS AND CONTINGENCIES (NOTE 12)
STOCKHOLDERS' EQUITY:
Additional paid-in capital	336,798	333,199
Accumulated deficit	(243,038)	(209,484)
Total stockholders' equity	93,767	123,722
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	103,064	134,051
Class A Common Stock
STOCKHOLDERS' EQUITY:
Common stock	5	5
Class B Common Stock
STOCKHOLDERS' EQUITY:
Common stock	2	2
Related Party
CURRENT ASSETS:
Due from related parties		$ 48
CURRENT LIABILITIES:
Due to related parties	$ 48