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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (1,846) $ (468)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 380 402
Amortization of deferred rent (17)
Stock-based compensation expense 137 171
Provision for (recoveries of) doubtful accounts, net 18 (2)
Change of inventory to net realizable value 255 (34)
Tax benefit from exercise of stock options (2)
Deferred income taxes (696) 25
Changes in operating assets and liabilities:    
Receivables 1,545 169
Inventories (319) (2,766)
Prepaid expenses and other assets (108) (136)
Accounts payable 172 1,361
Accrued liabilities 110 145
Income taxes payable 3 (215)
Deferred product revenue (22) 4
Other long-term liabilities 72
Net cash used in operating activities (299) (1,363)
Cash flows from investing activities:    
Purchase of property and equipment (62) (181)
Purchase of intangibles (62) (56)
Capitalized patent defense costs (1,283)
Proceeds from maturities and sales of marketable securities 3,304 1,906
Purchases of marketable securities (884) (2,437)
Net cash provided by (used in) investing activities 1,013 (768)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 11 28
Dividend payments (583) (439)
Repurchase and cancellation of stock (147) (928)
Net cash used in financing activities (719) (1,339)
Effect of exchange rate changes on cash and cash equivalents 11 9
Net increase (decrease) in cash and cash equivalents 6 (3,461)
Cash and cash equivalents at the beginning of the period 5,571 12,100
Cash and cash equivalents at the end of the period 5,577 8,639
Cash paid for income taxes $ 62 $ 1