CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 75,183	$ 117,472
Restricted cash	621	771
Accounts receivable, less allowance of $321 and $180 in 2023 and 2022, respectively	3,189	2,103
Unbilled receivables	942	454
Inventory	6,582	4,622
Prepaid expenses and other current assets	2,391	3,194
Total current assets	88,908	128,664
Property and equipment, net	2,999	3,248
Other long term assets	2,292	2,139
Total assets	94,199	134,051
CURRENT LIABILITIES:
Accounts payable	1,214	678
Deferred grant funding	621	771
Deferred revenue	1,453	1,378
Accrued expenses and other current liabilities	5,419	5,976
Total current liabilities	8,768	8,803
Long term deferred revenue	968	1,526
Other noncurrent liabilities	64
Total liabilities	9,800	10,329
COMMITMENTS AND CONTINGENCIES (NOTE 13)
STOCKHOLDERS' EQUITY:
Additional paid-in capital	338,114	333,199
Accumulated deficit	(253,722)	(209,484)
Total stockholders' equity	84,399	123,722
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	94,199	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	$ 61