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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities:    
Net income (loss) $ (2,199,000) $ 863,000
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 348,000 373,000
Loss on disposal of property and equipment 11,000  
Amortization 475,000 491,000
Amortization of premium (discounts) on investments, net 49,000 (248,000)
Stock-based compensation 1,956,000 1,605,000
Deferred tax liability (8,000)  
Changes in operating assets and liabilities:    
Trade accounts receivable 3,474,000 (1,551,000)
Inventory 116,000 86,000
Prepaid expenses and other assets (120,000) (500,000)
Accounts payable (756,000) 305,000
Accrued bonus (165,000) (674,000)
Accrued liabilities and other 296,000 125,000
Net cash provided by operating activities 3,477,000 875,000
Cash flows from investing activities:    
Purchases of available-for-sale securities (753,000) (30,080,000)
Maturities of available-for-sale securities 20,199,000 29,520,000
Purchases of property and equipment (560,000) (1,045,000)
Net cash provided by (used in) investing activities 18,886,000 (1,605,000)
Cash flows from financing activities:    
Repurchases of common stock (608,000) (799,000)
Proceeds from issuance of common stock, net 1,018,000 779,000
Net cash provided by (used in) financing activities 410,000 (20,000)
Net increase (decrease) in cash, cash equivalents and restricted cash 22,773,000 (750,000)
Cash, cash equivalents, and restricted cash; beginning of period 13,197,000 13,621,000
Cash, cash equivalents, and restricted cash; end of period 35,970,000 12,871,000
Supplemental disclosure of cash flow information:    
Taxes paid 137,000 54,000
Supplemental disclosure of non-cash investing and financing activities:    
Accrual of property and equipment   4,000
Cash and cash equivalents 35,795,000 $ 12,871,000
Restricted cash included in other assets $ 175,000