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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net (loss) income $ (1,127) $ 896
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 3,661 4,122
Loss (gain) on investments 3,304 (1,161)
Stock-based compensation expense 1,893 1,807
Other, net (62) 84
Inventory reserves (1,754) (2,131)
Changes in operating assets and liabilities:    
Accounts receivable, net 8,697 (4,762)
Other receivables (6,205) (1,220)
Inventory (29,685) 4,024
Prepaid expenses, other current assets and other assets (1,170) (417)
Accounts payable 24,818 5,629
Accrued expenses and other liabilities 3,803 3,317
Income taxes payable, net (1,304) 497
Net cash provided by operating activities 4,869 10,685
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,461) (741)
Proceeds from sales and maturities of available-for-sale investments 10,265 10,087
Purchases of available-for-sale investments (11,504) (11,350)
Net cash used in investing activities (2,700) (2,004)
Cash flows from financing activities:    
Tax withholdings related to stock-based compensation settlements (54) (113)
Proceeds from stock option exercises 568 1,244
Dividend payments (4,438) (4,361)
Proceeds from draw on line of credit 8,000  
Repayment of line of credit (8,000)  
Net cash used in financing activities (3,924) (3,230)
Net (decrease) increase in cash, cash equivalents and restricted cash (1,755) 5,451
Effect of exchange rate changes (1,032) (1,734)
Cash, cash equivalents and restricted cash, beginning of period 56,818 60,179
Cash, cash equivalents and restricted cash, end of period 54,031 63,896
Supplemental disclosure of non-cash investing activities:    
Right-of-use assets obtained in exchange for lease obligations 332 248
Purchases of property, plant and equipment included in accounts payable $ 392 $ 199