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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income $ 3,972 $ 3,765
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 1,983 1,596
Amortization of marketable securities premium 23 15
Stock-based compensation 1,088 816
Gain on disposal of equipment 24 2
Equity in income of unconsolidated joint ventures (1,125) (1,111)
Deferred tax assets (8)  
Changes in operating assets and liabilities:    
Accounts receivable (4,915) (3,886)
Inventories (2,586) (3,243)
Prepaid expenses and other current assets 810 (2,818)
Other assets (341) 135
Accounts payable (2,299) 745
Accrued liabilities (4,867) (4,018)
Other long-term liabilities, including royalties (665) (307)
Net cash used in operating activities (8,906) (8,309)
Cash flows from investing activities:    
Purchases of property, plant and equipment (6,294) (5,776)
Proceeds from sales and maturities of available-for-sale debt securities   240
Net cash used in investing activities (6,294) (5,536)
Cash flows from financing activities:    
Proceeds from common stock options exercised   704
Proceeds from sale of subsidiary shares to noncontrolling interests   538
Proceeds from bank loan 10,718  
Payments on bank loan (2,799)  
Formation of new subsidiary with noncontrolling interests   642
Proceeds from issuance of Tongmei's common stock to redeemable noncontrolling interests, net of costs   730
Net cash provided by financing activities 7,919 2,614
Effect of exchange rate changes on cash and cash equivalents 12 (165)
Net decrease in cash and cash equivalents (7,269) (11,396)
Cash and cash equivalents at the beginning of the year 36,763 72,602
Cash and cash equivalents at the end of the period 29,494 61,206
Supplemental disclosure of non-cash flow information:    
Conversion of related party borrowings to Additional Paid-in Capital 1,887  
Investment in subsidiary shares from noncontrolling interest $ 410  
Consideration payable to repurchase subsidiary shares from noncontrolling interests, included in accrued liabilities   $ 3,730