CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income (loss)	$ (21,470)	$ 9,528
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	4,357	3,891
Provision for severance benefits	2,330	1,670
Loss on foreign currency, net	9,082	6,380
Provision for inventory reserves	1,138	145
Stock-based compensation	1,120	1,638
Other, net	237	161
Changes in operating assets and liabilities
Accounts receivable, net	2,973	(1,213)
Inventories	1,062	1,456
Other receivables	2,376	667
Other current assets	1,456	(6,829)
Accounts payable	1,904	538
Other accounts payable	(1,424)	(702)
Accrued expenses	7,600	187
Accrued income taxes	(2,923)	(2,346)
Other current liabilities	(596)	(711)
Other non-current liabilities	(169)	(73)
Payment of severance benefits	(871)	(1,389)
Other, net	(306)	(178)
Net cash provided by operating activities	7,876	12,820
Cash flows from investing activities
Proceeds from settlement of hedge collateral	1,155	1,829
Payment of hedge collateral	(1,093)	(2,891)
Purchase of property, plant and equipment	(135)	(944)
Payment for intellectual property registration	(74)	(59)
Payment of guarantee deposits	(3,482)	(79)
Other, net	19	2
Net cash used in investing activities	(3,610)	(2,142)
Cash flows from financing activities
Proceeds from exercise of stock options	9	1,781
Acquisition of treasury stock	(12,264)	(830)
Repayment of financing related to water treatment facility arrangement	(126)	(134)
Repayment of principal portion of finance lease liabilities	(24)	(16)
Net cash provided by (used in) financing activities	(12,405)	801
Effect of exchange rates on cash and cash equivalents	(5,253)	(6,105)
Net increase (decrease) in cash and cash equivalents	(13,392)	5,374
Cash and cash equivalents at beginning of period	225,477	279,547
Cash and cash equivalents at end of period	212,085	284,921
Supplemental cash flow information
Cash paid for income taxes	2,644	5,421
Non-cash investing and financing activities
Property, plant and equipment additions in other accounts payable	629	524
Acquisition of treasury stock to satisfy the tax withholding obligations in connection with equity-based compensation	0	996
Unsettled common stock repurchases	$ 401	$ 0