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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net loss $ (1,847) $ (2,349)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 522 509
Amortization of right-of-use assets 143 148
Stock-based compensation expense 37 74
Provision for doubtful accounts, net 15 18
Change of inventory to net realizable value 201 185
Changes in operating assets and liabilities:    
Receivables 878 320
Inventories 1,428 1,184
Prepaid expenses and other assets 110 (25)
Accounts payable (396) (1,403)
Accrued liabilities (458) (156)
Income taxes payable 10 373
Deferred product revenue 34 (25)
Operating lease liabilities (146) (147)
Net cash provided by (used in) operating activities 531 (1,294)
Cash flows from investing activities:    
Purchase of property and equipment (30) (37)
Purchase of intangibles (48) 4
Capitalized patent defense costs (1,722) (1,221)
Proceeds from maturities and sales of marketable securities 1,208 427
Purchases of marketable securities (1,124) (4,764)
Net cash used in investing activities (1,716) (5,591)
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 3 9
Net cash provided by financing activities 3 9
Effect of exchange rate changes on cash and cash equivalents (27) (9)
Net decrease in cash and cash equivalents (1,209) (6,885)
Cash and cash equivalents at the beginning of the period 4,064 11,211
Cash and cash equivalents at the end of the period 2,855 4,326
Supplemental cash flow activities:    
Cash paid for income taxes 8
Interest paid $ 76