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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (832) $ (1,967)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization expense 221 794
Amortization of right-of-use assets 129 154
Share-based compensation expense 23 36
Change of inventory to net realizable value 23 0
Gain from disposal of assets (8) 0
Changes in operating assets and liabilities:    
Receivables 62 (86)
Legal settlement receivable 55,000 0
Inventories 365 525
Prepaid expenses and other assets 4,176 651
Accounts payable 536 (1,263)
Accrued liabilities (551) 286
Income taxes receivable 1,293 (5)
Deferred product revenue 8 (8)
Operating lease liabilities (124) (160)
Net cash provided by (used in) operating activities 60,321 (1,043)
Cash flows from investing activities:    
Purchase of property and equipment (27) (8)
Purchase of intangibles (42) (70)
Capitalized patent defense costs 0 (189)
Proceeds from maturities and sales of marketable securities 0 2,042
Net cash provided by (used in) investing activities (69) 1,775
Cash flows from financing activities:    
Net proceeds from equity-based compensation programs 0 2
Principal payments of debt (2,225) (370)
Net cash used in financing activities (2,225) (368)
Effect of exchange rate changes on cash and cash equivalents 4 (13)
Net increase in cash and cash equivalents 58,031 351
Cash and cash equivalents at the beginning of the period 986 1,071
Cash and cash equivalents at the end of the period 59,017 1,422
Supplemental cash flow activities:    
Cash paid for income taxes 18 26
Cash paid for interest $ 231 $ 51