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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net loss $ (9,462) $ (8,555)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 5,637 6,661
Provision for severance benefits 2,338 2,175
Loss (gain) on foreign currency, net 5,878 (18,085)
Provision (reversal) for inventory reserves (1,224) 845
Stock-based compensation 1,662 1,492
Impairment charges 0 7,362
Deferred income taxes 8 (649)
Others, net 128 476
Changes in operating assets and liabilities    
Accounts receivable, net 1,018 (4,600)
Inventories (1,220) (4,979)
Other receivables (1,246) (5,835)
Prepaid expenses 1,380 4,621
Other current assets (2,882) 675
Accounts payable 581 2,559
Other accounts payable (5,690) (4,972)
Accrued expenses 1,287 (2,022)
Accrued income taxes (41) 22
Other current liabilities 160 (546)
Other non-current liabilities 400 8
Payment of severance benefits (689) (9,843)
Others, net (969) 3,389
Net cash used in operating activities (2,946) (29,801)
Cash flows from investing activities    
Proceeds from settlement of hedge collateral 4,334 2,237
Payment of hedge collateral (7,828) 0
Purchase of property, plant and equipment (5,244) (12,083)
Payment for intellectual property registration (67) (85)
Collection of guarantee deposits 2,026 2,336
Payment of guarantee deposits (158) (297)
Others, net 49 180
Net cash used in investing activities (6,888) (7,712)
Cash flows from financing activities    
Proceeds from long-term borrowings 0 6,964
Proceeds from issuance of common stock 66 0
Acquisition of treasury stock (201) (4,020)
Repayment of financing related to water treatment facility arrangement (217) (225)
Repayment of principal portion of finance lease liabilities (66) (80)
Net cash provided by (used in) financing activities (418) 2,639
Effect of exchange rates on cash and cash equivalents (5,568) 9,590
Net decrease in cash and cash equivalents (15,820) (25,284)
Cash and cash equivalents at beginning of period 103,756 138,610
Cash and cash equivalents at end of period 87,936 113,326
Supplemental cash flow information    
Cash paid for interest on long-term borrowings 763 613
Cash refunded for income taxes (437) (1,168)
Non-cash investing activities    
Property, plant and equipment additions in other accounts payable $ 1,519 $ 939