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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities    
Net loss $ (15,200) $ (11,906)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 903 887
Provision for inventory obsolescence 109 506
Provision for product warranties 318 215
Loss on disposal of property and equipment 48 13
Stock based compensation 5,088 4,210
Provision for allowance for doubtful accounts 128 262
Changes in current assets and liabilities:    
Trade receivables (4,901) (558)
Income tax receivables 12 (7,228)
Prepaid expenses and other assets 1,355 (27)
Inventories (2,859) 615
Accounts payable 1,154 (965)
Accrued expenses and other liabilities 3,396 (2,090)
Net cash used in operating activities (10,449) (16,066)
Cash flows from investing activities    
Purchases of property and equipment (723) (581)
Net cash used in investing activities (723) (581)
Cash flows from financing activities    
Proceeds from stock option exercises 67 148
Repayment of related party note payable 0 (140)
Repayment of finance lease liabilities (238) (229)
Contributions from non-controlling interests 195 148
Net cash provided by (used in) financing activities 24 (73)
Effect of exchange rates on cash 103 (177)
Net change in cash and cash equivalents (11,045) (16,897)
Cash and cash equivalents, beginning of year 41,915 58,812
Cash and cash equivalents, end of year 30,870 41,915
Cash paid for:    
Interest expense 10 46
Income taxes 111 82
Non cash operating and investing activities:    
Transfer of right-of-use assets to property and equipment on exercise of purchase option 43 0
Transfer of inventory to property and equipment $ 0 $ 23