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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (12,160) $ (23,775)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 254 253
Stock-based compensation expense 1,126 4,111
Payments received on net investment in lease 2 2
Changes in assets and liabilities:    
Accounts receivable (915) (1,391)
Unbilled receivables (259) (387)
Inventory (1,122) (228)
Prepaid expenses and other current assets 272 (1,848)
Due from related parties 48 13
Prepaid inventory 281  
Other long term assets (18) 11
Accounts payable 954 (565)
Deferred grant funding (58) (679)
Deferred revenue (125) 584
Due to related parties 64 (1,884)
Accrued expenses and other current liabilities (1,835) (1,506)
Net cash used in operating activities (13,491) (27,289)
Cash flows from investing activities:    
Purchases of property and equipment (61) (308)
Net cash used in investing activities (61) (308)
Cash flows from financing activities:    
Proceeds from exercise of stock options 49  
Net cash provided by financing activities 49  
Net decrease in cash and cash equivalents and restricted cash (13,503) (27,597)
Cash, cash equivalents and restricted cash, beginning of period 118,243 191,160
Cash, cash equivalents and restricted cash, end of period 104,740 163,563
Reconciliation of cash, cash equivalents, and restricted cash reported in the balance sheets    
Cash and cash equivalents 104,027 161,580
Restricted cash 713 1,983
Total cash, cash equivalents and restricted cash 104,740 163,563
Supplemental disclosure of noncash information:    
Noncash acquisition of fixed assets $ 36 62
Write-off of notes receivable   $ 90