Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 1,016	$ 5,982
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	7,235	8,232
Loss (gain) on investments	7,882	(3,255)
Stock-based compensation expense	3,781	3,615
Deferred income taxes	(93)	441
Other, net	27	53
Inventory reserves	(4,296)	(3,167)
Changes in operating assets and liabilities:
Accounts receivable, net	(14,315)	(24,322)
Other receivables	2,606	1,412
Inventory	(53,982)	9,107
Prepaid expenses, other current assets and other assets	671	(4,767)
Accounts payable	42,968	16,814
Accrued expenses and other liabilities	2,179	6,999
Income taxes payable, net	(1,597)	1,069
Net cash (used in) provided by operating activities	(5,918)	18,213
Cash flows from investing activities:
Purchases of property, plant and equipment	(3,285)	(2,210)
Proceeds from sales and maturities of available-for-sale investments	25,071	20,597
Purchases of available-for-sale investments	(17,002)	(20,121)
Net cash provided by (used in) investing activities	4,784	(1,734)
Cash flows from financing activities:
Tax withholdings related to stock-based compensation settlements	(333)	(113)
Proceeds from stock option exercises	636	3,552
Dividend payments	(8,877)	(8,735)
Proceeds from draw on line of credit	28,000
Repayment of line of credit	(28,000)
Net cash used in financing activities	(8,574)	(5,296)
Net (decrease) increase in cash, cash equivalents and restricted cash	(9,708)	11,183
Effect of exchange rate changes	(3,742)	(1,381)
Cash, cash equivalents and restricted cash, beginning of period	56,818	60,179
Cash, cash equivalents and restricted cash, end of period	43,368	69,981
Supplemental disclosure of non-cash investing activities:
Right-of-use assets obtained in exchange for lease obligations	552	275
Purchases of property, plant and equipment included in accounts payable	$ 818	$ 144