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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ (1,202,000) $ 337,000
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation 122,000 177,000
Amortization 164,000 164,000
Amortization of premium (discounts) on investments, net 7,000 (82,000)
Stock-based compensation 668,000 514,000
Deferred tax liability   5,000
Changes in operating assets and liabilities:    
Trade accounts receivable 640,000 (967,000)
Inventory 197,000 68,000
Prepaid expenses and other assets 238,000 77,000
Accounts payable (291,000) 504,000
Accrued bonus (974,000) (1,612,000)
Accrued liabilities (426,000) (19,000)
Deferred obligation under operating lease (45,000) (41,000)
Net cash used in operating activities (902,000) (875,000)
Cash flows from investing activities:    
Purchases of available-for-sale securities (752,000) (10,462,000)
Maturities of available-for-sale securities 11,400,000 9,585,000
Purchases of property and equipment (115,000) (159,000)
Net cash provided by (used in) investing activities 10,533,000 (1,036,000)
Cash flows from financing activities:    
Repurchases of common stock (190,000) (193,000)
Proceeds from issuance of common stock, net 70,000 231,000
Net cash provided by (used in) financing activities (120,000) 38,000
Net increase (decrease) in cash, cash equivalents and restricted cash 9,511,000 (1,873,000)
Cash, cash equivalents, and restricted cash; beginning of period 13,197,000 13,621,000
Cash, cash equivalents, and restricted cash; end of period 22,708,000 11,748,000
Supplemental disclosure of cash flow information:    
Interest paid   1,000
Taxes paid 22,000 21,000
Supplemental disclosure of non-cash investing and financing activities:    
Accrual of property and equipment 21,000  
Cash and cash equivalents 22,533,000 $ 11,748,000
Restricted cash included in other assets $ 175,000