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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities    
Net loss $ (21,645) $ (38,031)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 9,938 12,171
Provision for severance benefits 2,868 4,552
Loss (gain) on foreign currency, net (10,612) 6,140
Provision (reversal) for inventory reserves 1,919 (1,615)
Stock-based compensation 1,615 4,093
Impairment charges 12,424 0
Deferred income taxes (569) 3,111
Others, net 220 552
Changes in operating assets and liabilities    
Accounts receivable, net (7,610) 3,560
Inventories (7,131) (2,365)
Other receivables (1,287) (1,030)
Other current assets 2,078 6,800
Accounts payable 641 619
Other accounts payable (6,803) (10,197)
Accrued expenses 1,925 (1,339)
Accrued income taxes (16) (1,459)
Other current liabilities (323) (240)
Other non-current liabilities (48) (345)
Payment of severance benefits (10,669) (1,889)
Others, net 3,446 (1,077)
Net cash used in operating activities (29,639) (17,989)
Cash flows from investing activities    
Proceeds from settlement of hedge collateral 2,237 627
Payment of hedge collateral 0 (612)
Purchase of property, plant and equipment (19,739) (4,175)
Payment for intellectual property registration (182) (263)
Collection of guarantee deposits 4,274 1,153
Payment of guarantee deposits (355) (2,090)
Proceeds from disposal of property, plant and equipment 554 0
Purchase of short-term financial instruments 0 (30,000)
Others, net 180 (37)
Net cash used in investing activities (13,031) (35,397)
Cash flows from financing activities    
Proceeds from long-term borrowings 10,611 30,059
Acquisition of treasury stock (4,340) (9,507)
Repayment of financing related to water treatment facility arrangement (341) (357)
Repayment of principal portion of finance lease liabilities (121) (104)
Net cash provided by financing activities 5,809 20,091
Effect of exchange rates on cash and cash equivalents 6,256 (3,702)
Net decrease in cash and cash equivalents (30,605) (36,997)
Cash and cash equivalents at beginning of period 138,610 158,092
Cash and cash equivalents at end of period 108,005 121,095
Supplemental cash flow information    
Cash paid for interest on long-term borrowings 927 618
Cash paid (refunded) for income taxes (1,043) 788
Non-cash investing activities    
Property, plant and equipment additions in other accounts payable $ 2,220 $ 2,324