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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (7,857) $ (17,805)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,764 2,289
Stock-based compensation 3,933 4,357
Change in fair value of warrant liabilities (4,239)
Allowance for bad debt (154) 683
Accrued interest (17) 4
Other 3 199
Changes in assets and liabilities:    
Accounts receivable 334 117
Inventories (348) (1,447)
Prepaid expenses and other assets (164) 213
Deferred cost of net revenue 600 (600)
Accounts payable 739 (193)
Right-of-use assets 500 418
Lease liabilities - operating (335) (462)
Deferred revenue and other liabilities (1,386) (1,192)
Net cash used in operating activities (5,627) (13,419)
Cash flows from investing activities:    
Purchases of property and equipment (93) (577)
Purchases of intangible assets (21)
Proceeds from maturities of marketable securities 1,100 11,534
Purchases of marketable securities (497)
Net cash provided by investing activities 1,007 10,439
Cash flows from financing activities:    
Proceeds from sale of common stock, net 3,595
Taxes paid to net share settle equity awards (36) (61)
Repayment of financing leases (78)
Net cash provided by (used in) financing activities 3,481 (61)
Net decrease in cash and cash equivalents (1,139) (3,041)
Cash and cash equivalents at beginning of period 1,828 5,893
Cash and cash equivalents at end of period 689 2,852
Supplemental disclosure:    
Initial recognition of warrant liability 3,162
Recognition of right-of-use asset and lease liability 1,003
Unrealized (gain) loss on securities $ (25) $ 36