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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities:    
Net loss $ (39,233) $ (33,279)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 4,535 5,946
Debt issuance costs 0 2,397
Operating lease expense 821 1,075
Stock-based compensation 1,171 1,258
Change in fair value of financial instruments, net of interest paid on Secured Convertible Notes 21,003 5,024
Foreign exchange differences (191) (2,208)
Loss on disposal of property and equipment 168 136
Expense for estimated credit losses on accounts receivable, net of recoveries (49) 47
Equity in net (income) loss of affiliate 0 (11)
Non-cash change in contract liabilities (249) (951)
Other, net 0 100
Changes in operating assets and liabilities:    
Accounts receivable 1,534 (992)
Prepaid expenses and other current assets 1,251 (2,362)
Accounts payable (536) 2,683
Contract liabilities 746 52
Accrued expenses and other liabilities 513 (1,652)
Operating lease liabilities (548) (1,154)
Net cash used in operating activities (9,064) (23,891)
Cash flows from investing activities:    
Purchases of property and equipment (2,689) (3,334)
Other 0 14
Net cash used in investing activities (2,689) (3,320)
Cash flows from financing activities:    
Proceeds from Secured Convertible Notes 0 30,000
Payments of debt issuance costs 0 (2,397)
Payments for withholding taxes related to the net share settlement of equity awards (653) (295)
Proceeds from exercise of stock options 1,275 53
Net cash provided by financing activities 21,430 27,361
Net increase in cash, cash equivalents and restricted cash 9,677 150
Effect of foreign exchange rate changes on cash and cash equivalents 220 2,026
Cash, cash equivalents and restricted cash - beginning of period 23,682 24,603
Cash, cash equivalents and restricted cash - end of period 33,579 26,779
At The Market Program    
Cash flows from financing activities:    
Proceeds from issuance stock 2,039 0
Registered Direct Offering    
Cash flows from financing activities:    
Proceeds from issuance stock $ 18,769 $ 0