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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (3,279) $ 926
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 463 493
Loss on disposal of property and equipment 11  
Amortization of intangibles 629 655
Amortization of (discounts) premium on investments, net 64 (312)
Stock-based compensation 2,564 2,204
Deferred tax liability 6 14
Changes in operating assets and liabilities:    
Trade accounts receivable 2,874 (643)
Inventory 177 158
Prepaid expenses and other assets (164) (171)
Accounts payable (862) (303)
Accrued compensation 163 (625)
Accrued liabilities and other 843 168
Deferred obligation under operating lease 215 (196)
Net cash provided by operating activities 3,704 2,368
Cash flows from investing activities:    
Purchases of available-for-sale securities (753) (36,456)
Maturities of available-for-sale securities 22,366 35,270
Purchases of property and equipment (727) (1,214)
Net cash provided by (used in) investing activities 20,886 (2,400)
Cash flows from financing activities:    
Repurchase of common stock (608) (1,227)
Proceeds from issuance of common stock 1,169 835
Net cash provided by (used in) financing activities 561 (392)
Net increase (decrease) in cash, cash equivalents, and restricted cash 25,151 (424)
Cash, cash equivalents, and restricted cash; beginning of period 13,197 13,621
Cash, cash equivalents, and restricted cash; end of period 38,348 13,197
Supplemental disclosure of cash flow information    
Interest paid   1
Taxes paid 164 71
Supplemental disclosure of non-cash investing and financing activities:    
Accrual of property and equipment 2 4
Cash and cash equivalents 38,173 13,197
Restricted cash included in other assets 175  
Total cash, cash equivalents, and restricted cash $ 38,348 $ 13,621