CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 93,948	$ 117,472
Restricted cash	969	771
Accounts receivable, less allowance of $175 and $180 as of June 30, 2023 and December 31, 2022, respectively	3,948	2,103
Unbilled receivables	663	454
Inventory	5,983	4,622
Prepaid expenses and other current assets	2,312	3,194
Total current assets	107,823	128,664
Property and equipment, net	3,058	3,248
Other long term assets	1,725	2,139
Total assets	112,606	134,051
CURRENT LIABILITIES:
Accounts payable	1,372	678
Deferred grant funding	969	771
Deferred revenue	1,490	1,378
Accrued expenses and other current liabilities	4,159	5,976
Total current liabilities	8,035	8,803
Long term deferred revenue	1,280	1,526
Total liabilities	9,315	10,329
COMMITMENTS AND CONTINGENCIES (NOTE 12)
STOCKHOLDERS' EQUITY:
Additional paid-in capital	335,565	333,199
Accumulated deficit	(232,281)	(209,484)
Total stockholders' equity	103,291	123,722
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	112,606	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	$ 45