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INTANGIBLE ASSETS, NET | 12 Months Ended
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Dec. 31, 2016
INTANGIBLE ASSETS, NET |
INTANGIBLE ASSETS, NET | 10. INTANGIBLE ASSETS, NET The following table summarizes the Company's intangible assets:
At December 31, 2016 |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |
|  | $ |  | $ |  | $ |
Technical know-how |  |  | 1,431 |  |  | (1,183 | ) |  | 248 |
Computer software |  |  | 15,884 |  |  | (7,710 | ) |  | 8,174 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total intangible assets, net |  |  | 17,315 |  |  | (8,893 | ) |  | 8,422 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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At December 31, 2015 |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |
|  | $ |  | $ |  | $ |
Power purchase agreements |  |  | 71,770 |  |  | (37 | ) |  | 71,733 |
Technical know-how |  |  | 1,528 |  |  | (1,164 | ) |  | 364 |
Computer software |  |  | 14,226 |  |  | (7,385 | ) |  | 6,841 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total intangible assets, net |  |  | 87,524 |  |  | (8,586 | ) |  | 78,938 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Amortization expense for the years ended December 31, 2014, 2015 and 2016 were $1,559, $2,235 and $6,544, respectively. Amortization expenses of the above intangible assets are expected to be approximately $2.5 million, $2.2 million, $1.4 million, $1.0 million and $1.3 million for the years ended December 31, 2017, 2018, 2019, 2020, 2021 and thereafter, respectively.

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