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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net loss $ (16,687,000) $ (14,172,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 1,590,000 1,531,000
Impairment of goodwill and intangible assets 13,493,000
Amortization of deferred rent 12,000 (44,000)
Stock-based compensation expense 463,000 665,000
Provision for doubtful accounts, net 159,000 252,000
Write-down of inventory to net realizable value 787,000 649,000
Loss on disposal of assets 1,000 7,000
Deferred income taxes 6,531,000 (1,877,000)
Changes in operating assets and liabilities:    
Receivables 835,000 (526,000)
Inventories 155,000 (10,756,000)
Prepaid expenses and other assets 43,000 9,000
Accounts payable (392,000) 572,000
Accrued liabilities 184,000 (23,000)
Income taxes payable (258,000) 853,000
Deferred product revenue (8,000) 740,000
Other long-term liabilities (36,000) (644,000)
Net cash used in operating activities (6,621,000) (9,271,000)
Cash flows from investing activities:    
Capitalized patent defense costs (4,698,000) (2,289,000)
Purchase of property and equipment (336,000) (638,000)
Purchase of intangible assets (101,000) (278,000)
Proceeds from maturities and sales of marketable securities 10,516,000 17,640,000
Purchase of marketable securities (2,230,000) (4,248,000)
Net cash provided by investing activities 3,151,000 10,187,000
Cash flows from financing activities:    
Issuance of common stock 9,883,000
Net proceeds from equity-based compensation programs 39,000 130,000
Repurchase and cancellation of stock options (287,000)
Dividend payments (583,000) (2,239,000)
Payments for stock repurchases (147,000) (5,119,000)
Net cash used in financing activities 9,192,000 (7,515,000)
Effect of exchange rate changes on cash and cash equivalents (82,000) 70,000
Net increase (decrease) in cash and cash equivalents 5,640,000 (6,529,000)
Cash and cash equivalents at the beginning of the year 5,571,000 12,100,000
Cash and cash equivalents at the end of the year 11,211,000 5,571,000
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 11,000 $ 6,000