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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ 505 $ (8,408)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 2,313 1,914
Amortization of right of use of assets 563 561
Stock-based compensation expense 63 217
Provision for doubtful accounts, net 82 (207)
Write-down of inventory to net realizable value 1,517 891
Loss on disposal of assets 34
Changes in operating assets and liabilities:    
Receivables 192 1,511
Inventories 1,155 3,565
Prepaid expenses and other assets (417) (4,148)
Accounts payable 1,079 (858)
Accrued liabilities (865) 627
Income taxes receivable (7,087) 368
Deferred product revenue (50) (110)
Operating lease liabilities (570) (557)
Other long-term liabilities 538 (56)
Net cash used in operating activities (982) (4,656)
Cash flows from investing activities:    
Capitalized patent defense costs (6,728) (5,086)
Purchase of property and equipment (284) (205)
Purchase of intangible assets (205) (76)
Proceeds from maturities and sales of marketable securities 4,605 9,243
Purchase of marketable securities (2,932) (9,003)
Net cash used in investing activities (5,544) (5,127)
Cash flows from financing activities:    
Issuance of common stock 4,764
Net proceeds from issuance of senior convertible notes 2,654
Proceeds from Paycheck Protection Program loan 1,499
Net proceeds from equity-based compensation programs 14 23
Net cash provided by financing activities 6,277 2,677
Effect of exchange rate changes on cash and cash equivalents (12) (41)
Net increase (decrease) in cash and cash equivalents (261) (7,147)
Cash and cash equivalents at the beginning of the year 4,064 11,211
Cash and cash equivalents at the end of the year 3,803 4,064
Supplemental disclosure of cash flow information:    
Cash paid for income taxes 79 1
Interest paid $ 244