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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities    
Net income (loss) $ (5,395) $ (2,568)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 710 621
Share-based compensation expense 1,448 936
Changes in operating assets and liabilities:    
Account receivable (500) 2,425
Income tax receivable (1,074) 3,225
Deferred cost of goods sold 0 544
Prepaid expenses and other current assets 302 (1,955)
Accounts payable (812) (1,409)
Accrued expenses 194 (10)
Deferred revenue 0 0
Income tax payable 4 0
Net cash provided by (used in) operating activities (5,123) 1,809
Investing activities    
Purchase of property and equipment (161) (637)
Net cash used in investing activities (161) (637)
Financing activities    
Issuance of common stock under stock option plan 0 1,022
Net cash provided by (used in) financing activities 0 1,022
Effect of foreign exchange rate on cash and cash equivalents 122 319
Net change in cash and cash equivalents (5,162) 2,513
Cash and cash equivalents, beginning of period 236,983 237,366
Cash and cash equivalents, end of period 231,821 239,879
Supplemental information:    
Accrued purchases of property and equipment $ 65 $ 156