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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities    
Net loss $ (11,906) $ (19,706)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 887 754
Provision for inventory obsolescence 506 132
Provision for product warranties 215 321
Loss on disposal of property and equipment 13 89
Stock based compensation 4,210 3,581
Realized and unrealized gains on short term investments 0 (164)
Provision (benefit) for allowance for doubtful accounts 262 (163)
Changes in current assets and liabilities:    
Trade receivables (558) (3,970)
Income tax receivables (7,228) 180
Prepaid expenses and other assets 27 586
Inventories 615 (2,367)
Accounts payable (965) 1,054
Accrued expenses and other liabilities (2,090) 2,370
Net cash used in operating activities (16,066) (18,475)
Cash flows from investing activities    
Purchases of property and equipment (581) (1,301)
Purchases of marketable securities 0 (18,884)
Proceeds of marketable securities 0 80,726
Net cash (used in) provided by investing activities (581) 60,541
Cash flows from financing activities    
Proceeds from stock option exercises 148 207
Repayment of related party note payable (140) 0
Repayment of finance lease liabilities (229) (60)
Contributions from non-controlling interests 148 0
Net cash (used in) provided by financing activities (73) 147
Effect of exchange rates on cash (177) 3
Net change in cash and cash equivalents (16,897) 42,216
Cash and cash equivalents, beginning of year 58,812 16,596
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance 41,915 58,812
Cash paid for:    
Interest expense 46 8
Income taxes 82 325
Non cash operating and investing activities:    
Transfer of other assets to fixed assets 0 42
Transfer of inventory to fixed assets $ 23 $ 277