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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Profit (loss) for the year $ 45,160 $ (16,184) $ 6,026
Adjustments for:      
Depreciation and amortization 23,596 24,399 20,327
Expected credit loss recognized on accounts receivable 0 67 290
Share-based compensation expenses 763 457 408
Gain on disposal of property, plant and equipment, net (244) (90) 0
Gain on re-measurement of the pre-existing relationships in a business combination 0 0 (1,662)
Changes in fair value of financial assets at fair value through profit or loss (472) (3,746) (2,036)
Interest income (967) (2,013) (2,429)
Finance costs 1,705 2,325 1,232
Income tax expense 11,712 416 994
Share of losses of associates 638 477 1,095
Inventories write downs 11,919 25,447 17,724
Unrealized foreign currency exchange losses (gains) (239) 121 294
cash flows from operating activities before changes in operating Capital 93,571 31,676 42,263
Changes in:      
Accounts receivable (78,297) 23,992 (794)
Inventories 24,772 (6,660) (45,085)
Other current assets (2,881) 35 (1,511)
Accounts payable 55,767 (36,180) 10,567
Accounts payable to related parties 1,568 0 0
Other payable to related parties 352 (1,577) 1,597
Net defined benefit liabilities (15) 6 (128)
Contract liabilities 4,720 1,447 (149)
Other current liabilities 1,134 (581) 902
Other non-current liabilities 5,365 250 (458)
Cash generated from operating activities 106,056 12,408 7,204
Interest received 1,066 2,060 2,361
Interest paid (1,811) (2,372) (877)
Income tax paid (2,701) (4,440) (4,679)
Net cash provided by operating activities 102,610 7,656 4,009
Cash flows from investing activities:      
Acquisitions of property, plant and equipment (5,786) (45,922) (49,672)
Proceeds from disposal of property, plant and equipment 249 98 1
Acquisitions of intangible assets (87) (152) (925)
Acquisitions of financial assets at amortized cost (3,829) (4,023) (4,766)
Proceeds from disposal of financial assets at amortized cost 6,735 4,171 3,514
Acquisitions of financial assets at fair value through profit or loss (19,743) (50,487) (26,277)
Proceeds from disposal of financial assets at fair value through profit or loss 12,068 50,648 48,764
Acquisition of business 0 (700) (700)
Acquisition of a subsidiary, net of cash acquired 1,302 (400) (3,301)
Proceeds from capital reduction of investment 32 47 55
Acquisitions of equity method investments (792) (129) (2,093)
Decrease (increase) in refundable deposits (13,992) (2,821) 87
Releases (pledges) of restricted deposit (8) 323 14
Cash paid for loan made to related party 0 (1,200) (780)
Cash received from loan made to related party 0 2,780 0
Cash received in advance from disposal of land 1,486 0 0
Income tax paid for disposal of financial assets at fair value through profit or loss 0 0 (2,187)
Net cash used in investing activities (22,365) (47,767) (38,266)
Cash flows from financing activities:      
Payments of cash dividends (4) 0 (17,210)
Proceeds from issuance of new shares by subsidiaries 884 0 11
Proceeds from short-term unsecured borrowings 208,137 244,224 40,000
Repayments of short-term unsecured borrowings (265,355) (207,006) (20,000)
Proceeds from long-term unsecured borrowings 60,000 0 0
Repayments of long-term unsecured borrowings (1,500) 0 0
Proceeds from short-term secured borrowings 278,000 158,000 91,000
Repayments of short-term secured borrowings (338,000) (158,000) (74,000)
Release (pledge) of restricted deposit 60,000 0 (17,000)
Payment of lease liabilities (2,608) (1,957) 0
Proceeds from exercise of employee stock options 3,707 0 0
Net cash provided by financing activities 3,261 35,261 2,801
Effect of foreign currency exchange rate changes on cash and cash equivalents 377 (532) (130)
Net increase (decrease) in cash and cash equivalents 83,883 (5,382) (31,586)
Cash and cash equivalents at beginning of year 101,055 106,437 138,023
Cash and cash equivalents at end of year $ 184,938 $ 101,055 $ 106,437