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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ (3,472) $ (5,410)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 2,390 2,042
Amortization of right-of-use assets 449 458
Share-based compensation expense 90 100
Provision for doubtful accounts, net 0 (1)
Change of inventory to net realizable value 221 798
Gain recognized on Paycheck Protection Plan Loan forgiveness (1,528) 0
Changes in operating assets and liabilities:    
Receivables 868 (48)
Inventories 710 1,724
Prepaid expenses and other assets 2,051 (973)
Accounts payable (3,336) 65
Accrued liabilities (54) 360
Income taxes receivable 0 (52)
Deferred product revenue 19 (66)
Operating lease liabilities (468) (474)
Net cash used in operating activities (2,060) (1,477)
Cash flows from investing activities:    
Purchase of property and equipment (17) (39)
Purchase of intangibles (93) (220)
Capitalized patent defense costs (642) (5,348)
Proceeds from maturities and sales of marketable securities 3,008 1,971
Purchases of marketable securities 0 (526)
Net cash provided by (used in) investing activities 2,256 (4,162)
Cash flows from financing activities:    
Net proceeds from issuance of common stock and warrants 0 9,288
Proceeds from issuance of short-term notes 0 2,000
Net proceeds from equity-based compensation programs 3 12
Paycheck Protection Program loan refund upon full forgiveness net of loan payments 768 0
Principal payments of long-term debt (540) (270)
Net cash provided by financing activities 231 11,030
Effect of exchange rate changes on cash and cash equivalents (48) (33)
Net increase in cash and cash equivalents 379 5,358
Cash and cash equivalents at the beginning of the period 1,071 3,803
Cash and cash equivalents at the end of the period 1,450 9,161
Supplemental cash flow activities:    
Cash paid for income taxes 68 91
Cash paid for interest $ 140 $ 200