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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income (loss) $ 998,000 $ (4,296,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation 268,000 266,000
Amortization 328,000 338,000
Amortization of discounts on investments, net (185,000) (53,000)
Stock-based compensation 1,056,000 2,128,000
Deferred tax liability (8,000) 19,000
Gain on deferred purchase price liability   (389,000)
Changes in operating assets and liabilities:    
Trade accounts receivable (2,709,000) 1,201,000
Inventory 256,000 (52,000)
Prepaid expenses and other assets (41,000) (17,000)
Accounts payable 1,231,000 132,000
Accrued bonus (1,168,000) (726,000)
Accrued liabilities 277,000 (78,000)
Deferred obligation under operating lease (79,000) (52,000)
Net cash provided by (used in) operating activities 224,000 (1,579,000)
Cash flows from investing activities:    
Purchases of available-for-sale securities (21,065,000) (12,650,000)
Maturities of available-for-sale securities 20,870,000 15,180,000
Purchases of property and equipment (405,000) (653,000)
Net cash provided by (used in) investing activities (600,000) 1,877,000
Cash flows from financing activities:    
Repayment of notes payable   (667,000)
Payment on deferred purchase price liability   (375,000)
Common stock repurchases (193,000) (1,323,000)
Proceeds from exercise of stock options 589,000 300,000
Net cash provided by (used in) financing activities 396,000 (2,065,000)
Net increase (decrease) in cash and cash equivalents 20,000 (1,767,000)
Cash and cash equivalents, beginning of period 13,621,000 15,026,000
Cash and cash equivalents, end of period 13,641,000 13,259,000
Supplemental disclosure of cash flow information:    
Interest paid   27,000
Taxes paid 46,000 $ 18,000
Supplemental disclosure of non-cash investing and financing activities:    
Accrual of property and equipment $ 169,000