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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net loss $ (4,009) $ (1,288)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 769 779
Amortization of deferred rent 1 (35)
Stock-based compensation expense 266 340
Provision for doubtful accounts, net 59 6
Change of inventory to net realizable value 425 21
Deferred income taxes (927)
Changes in operating assets and liabilities:    
Receivables 2,585 280
Inventories (33) (5,801)
Prepaid expenses and other assets 54 (190)
Accounts payable (595) 1,429
Accrued liabilities 38 253
Income taxes payable (540) (393)
Deferred product revenue (37) (85)
Other long-term liabilities 79
Net cash used in operating activities (1,865) (4,650)
Cash flows from investing activities:    
Purchase of property and equipment (130) (404)
Purchase of intangibles (98) (127)
Capitalized patent defense costs (2,383)
Proceeds from maturities and sales of marketable securities 5,128 3,631
Purchases of marketable securities (1,403) (3,051)
Net cash provided by investing activities 1,114 49
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 20 82
Dividend payments (583) (1,051)
Repurchase and cancellation of stock (147) (3,210)
Net cash used in financing activities (710) (4,179)
Effect of exchange rate changes on cash and cash equivalents (31) 47
Net decrease in cash and cash equivalents (1,492) (8,733)
Cash and cash equivalents at the beginning of the period 5,571 12,100
Cash and cash equivalents at the end of the period 4,079 3,367
Cash paid for income taxes $ 11 $ 6