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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Profit (loss) for the year $ 433,935 $ 45,160 $ (16,184)
Adjustments for:      
Depreciation and amortization 21,342 23,596 24,399
Expected (reversal of) credit losses recognized on accounts receivable (190) 0 67
Share-based compensation expenses 700 763 457
Gains on disposal of property, plant and equipment, net (147) (244) (90)
Changes in fair value of financial assets at fair value through profit or loss 284 (472) (3,746)
Interest income (876) (967) (2,013)
Finance costs 1,074 1,705 2,325
Income tax expense 110,657 11,712 416
Share of losses of associates 1,392 638 477
Inventories write downs 9,448 11,919 25,447
Unrealized foreign currency exchange losses (gains) (953) (239) 121
cash flows from operating activities before changes in operating Capital 576,666 93,571 31,676
Changes in:      
Accounts receivable (including related parties) (166,395) (78,297) 23,992
Inventories (99,341) 24,772 (6,660)
Other receivable from related parties (17) 0 0
Other current assets (7,633) (2,881) 35
Other non-current assets (19,460) 0 0
Accounts payable (including related parties) 74,954 57,335 (36,180)
Other payable to related parties (931) 352 (1,577)
Contract liabilities 41,262 4,720 1,447
Other current liabilities 13,736 1,134 (581)
Other non-current liabilities (4,697) 5,350 256
Cash generated from operating activities 408,144 106,056 12,408
Interest received 852 1,066 2,060
Interest paid (1,074) (1,811) (2,372)
Income tax paid (19,646) (2,701) (4,440)
Net cash provided by operating activities 388,276 102,610 7,656
Cash flows from investing activities:      
Acquisitions of property, plant and equipment (7,562) (5,786) (45,922)
Proceeds from disposal of property, plant and equipment 0 249 98
Acquisitions of intangible assets (468) (87) (152)
Acquisitions of financial assets at amortized cost (25,362) (3,829) (4,023)
Proceeds from disposal of financial assets at amortized cost 8,011 6,735 4,171
Acquisitions of financial assets at fair value through profit or loss (23,417) (19,743) (50,487)
Proceeds from disposal of financial assets at fair value through profit or loss 29,141 12,068 50,648
Acquisition of business 0 0 (700)
Acquisition of a subsidiary, net of cash acquired 0 1,302 (400)
Proceeds from capital reduction of investment 151 32 47
Acquisitions of equity method investments (598) (792) (129)
Increase in refundable deposits (213,056) (13,992) (2,821)
Releases (pledges) of restricted deposit (2,595) (8) 323
Cash paid for loan made to related party 0 0 (1,200)
Cash received from loan made to related party 0 0 2,780
Cash received in advance from disposal of land 3,075 1,486 0
Net cash used in investing activities (232,680) (22,365) (47,767)
Cash flows from financing activities:      
Payments of cash dividends (47,424) (4) 0
Proceeds from issuance of new shares by subsidiaries 0 884 0
Purchases of subsidiary shares from noncontrolling interests (1,627) 0 0
Proceeds from short-term unsecured borrowings 15,000 208,137 244,224
Repayments of short-term unsecured borrowings (15,000) (265,355) (207,006)
Proceeds from long-term unsecured borrowings 0 60,000 0
Repayments of long-term unsecured borrowings (6,000) (1,500) 0
Proceeds from short-term secured borrowings 611,600 278,000 158,000
Repayments of short-term secured borrowings (564,200) (338,000) (158,000)
Release (pledge) of restricted deposit (47,400) 60,000 0
Payment of lease liabilities (4,668) (2,608) (1,957)
Guarantee deposits received 54,050 0 0
Proceeds from exercise of employee stock options 1,182 3,707 0
Net cash provided by (used in) financing activities (4,487) 3,261 35,261
Effect of foreign currency exchange rate changes on cash and cash equivalents (23) 377 (532)
Net increase (decrease) in cash and cash equivalents 151,086 83,883 (5,382)
Cash and cash equivalents at beginning of year 184,938 101,055 106,437
Cash and cash equivalents at end of year $ 336,024 $ 184,938 $ 101,055