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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net loss $ (15,233) $ (19,412)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 5,198 6,084
Depreciation and amortization 4,657 3,648
Reversal of uncertain tax positions (2,171) (2)
Deferred income tax expense (benefit) 428 (768)
Amortization of acquired intangible assets 90 1,118
Other 8 10
Changes in operating assets and liabilities:    
Accounts receivable, net (1,339) (4,036)
Inventories (291) 976
Prepaid expenses and other current and long-term assets, net 1,535 (46)
Accounts payable 486 1,282
Accrued current and long-term liabilities (6,688) 1,537
Income taxes payable 486 452
Net cash used in operating activities (12,834) (9,157)
Cash flows from investing activities:    
Purchases of property and equipment (1,592) (3,475)
Purchases of licensed technology (1,415) 0
Proceeds from sales and maturities of marketable securities 0 250
Net cash used in investing activities (3,007) (3,225)
Cash flows from financing activities:    
Net proceeds from issuance of equity interest to non-controlling interest 10,738 0
Payments on asset financings (1,457) (1,195)
Net proceeds from issuance of equity interest to certain entities owned by employees 1,407 12,329
Proceeds from issuances of common stock under employee equity incentive plans 387 1,282
Net proceeds from issuance of equity interest to redeemable non-controlling interest 0 29,976
Net proceeds from "at the market" equity offering 0 320
Net cash provided by financing activities 11,075 42,712
Net increase (decrease) in cash and cash equivalents (4,766) 30,330
Cash and cash equivalents, beginning of period 61,587 31,257
Cash and cash equivalents, end of period 56,821 61,587
Supplemental disclosure of cash flow information:    
Cash paid during the year for interest 196 162
Cash paid for income taxes, net of refunds received 188 376
Non-cash investing and financing activities:    
Acquisitions of property and equipment and other assets under extended payment terms $ 1,674 $ 1,229