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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Cash flows from operating activities:      
Net income (loss) $ 5,982 $ (9,217)  
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 8,232 8,404  
(Gain) loss on investments (3,255) 1,025  
Stock-based compensation expense 3,615 3,446  
Deferred income taxes 441 (5)  
Other 53 138  
Asset impairments   65  
Changes in operating assets and liabilities:      
Accounts receivable, net (24,322) (4,727)  
Other receivables 1,412 (9,468)  
Inventory, net 5,940 (7,878)  
Prepaid expenses, other current assets and other assets (4,767) 1,444  
Accounts payable 16,814 17,389  
Accrued expenses and other liabilities 6,999 2,097  
Income taxes payable, net 1,069 (1,032)  
Net cash provided by operating activities 18,213 1,681  
Cash flows from investing activities:      
Purchases of property, plant and equipment (2,210) (3,148)  
Proceeds from sales and maturities of available-for-sale investments 20,597 63,318  
Purchases of available-for-sale investments (20,121) (31,897)  
Acquisition of note receivable   (523)  
Net cash provided by (used in) investing activities (1,734) 27,750  
Cash flows from financing activities:      
Proceeds from stock option exercises 3,552    
Tax withholdings related to stock-based compensation settlements (113)    
Dividend payments (8,735) (8,665)  
Repayment of bonds payable   (24,600)  
Net cash used in financing activities (5,296) (33,265)  
Net increase (decrease) in cash, cash equivalents and restricted cash 11,183 (3,834)  
Effect of exchange rate changes (1,381) 306  
Cash, cash equivalents and restricted cash, beginning of period 60,179 73,773 $ 73,773
Cash, cash equivalents and restricted cash, end of period 69,981 70,245 $ 60,179
Supplemental disclosure of non-cash investing activities:      
Right-of-use assets obtained in exchange for lease obligations 275 93  
Purchases of property, plant and equipment included in accounts payable $ 144 $ 198