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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating activities:      
Net income $ 31,234 $ 10,793 $ 4,283
Net Income (Loss) Available to Common Stockholders, Basic 31,234 10,793 4,283
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Lowerof Cost or Market Adjustment 3,707 2,832 941
Depreciation and amortization 14,188 9,424 6,169
Deferred income taxes, net 11,426    
Loss on disposal of assets 126 78 12
Share-based compensation 3,833 2,120 2,061
Unrealized foreign exchange loss (gain) (937) 2,462 1,288
Changes in operating assets and liabilities:      
Accounts receivable, trade (11,147) (7,531) (9,703)
Notes receivable   977 (977)
Inventories 10,207 (37,502) (16,105)
Other current assets 4,119 (2,624) (745)
Accounts payable 9,105 (1,258) 18,947
Accrued liabilities 4,095 5,017 2,359
Net cash provided by (used in) operating activities 57,104 (15,212) 8,530
Investing activities:      
Purchase of short-term investments   (175) (246)
Maturities of short-term investments 7,752    
Change in restricted cash for construction in progress (8)    
Purchase of property, plant and equipment (49,442) (57,080) (41,129)
Proceeds from disposal of equipment 14 351 47
Deposits and deferred charges 688 (4,238) (720)
Purchase of intangible assets (547) (478) (3,340)
Net cash used in investing activities (41,543) (61,620) (45,388)
Financing activities:      
Proceeds from issuance notes payable and long-term debt 28,858 16,944 8,150
Principal payments of long-term debt and notes payable (5,855) (2,413) (8,076)
Proceeds from line of credit borrowings 117,172 144,386 53,658
Repayments of line of credit borrowings (163,068) (121,386) (50,733)
Proceeds from bank acceptance payable 5,850 8,257 5,925
Repayments of bank acceptance payable (8,398) (6,361) (6,986)
Repayments of notes payable (1,000) (1,000) (1,000)
Decrease (increase) in restricted cash 2,987 (4,419) 266
Exercise of stock options 859 452 365
Proceeds from common stock offering, net 27,237 38,648 45,681
Other   6  
Net cash provided by financing activities 4,642 73,114 47,250
Effect of exchange rate changes on cash 1,947 (383) (223)
Net increase (decrease) in cash 22,150 (4,101) 10,169
Cash and cash equivalents at beginning of period 28,074 32,175 22,006
Cash and cash equivalents at end of period 50,224 28,074 32,175
Cash paid for (received from):      
Interest 1,689 1,070 329
Income taxes $ (12) $ 650 148
Non-cash investing and financing activities:      
Purchase of intangible assets with notes payable     $ 3,000