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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) | Total | Ordinary shares [Member] | Treasury Stock [Member] | Additional paid in capital [Member] | Accumulated Loss [Member] | Accumulated other comprehensive income (loss) [Member] | Noncontrolling interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 206,768,070 | $ 22,358 | $ (398,672) | $ 203,125,494 | $ (16,018,293) | $ 20,037,183 |
Balance, shares at Dec. 31, 2014 |  | 223,577,853 |  |  |  |  |
Net income | 13,047,584 |  |  |  | 12,956,889 |  | 90,695
Other comprehensive income (loss) | (11,286,150) |  |  |  |  | (11,256,870) | (29,280)
Share-based compensation | 3,687,951 |  |  | 3,687,951 |  |  |
Follow-on equity offering, net of issuance costs of $2,033,041 | 27,996,959 | $ 3,850 |  | 27,993,109 |  |  |
Follow-on equity offering, net of issuance costs of $2,033,041,shares |  | 38,500,000 |  |  |  |  |
Options exercised | 275,783 | $ 112 |  | 275,671 |  |  |
Options exercised, shares |  | 1,115,625 |  |  |  |  |
Repurchase of ordinary shares | (1,350,164) |  | (1,350,164) |  |  |  |
Repurchase of ordinary shares, shares |  | (2,356,900) |  |  |  |  |
Capital injection from noncontrolling shareholders | 2,516,457 |  |  | 1,275,845 |  |  | 1,240,612
Balance at Dec. 31, 2015 | 241,656,490 | $ 26,320 | (1,748,836) | 236,358,070 | (3,061,404) | 8,780,313 | 1,302,027
Balance, shares at Dec. 31, 2015 |  | 260,836,578 |  |  |  |  |
Net income | 43,923,997 |  |  |  | 43,493,756 |  | 430,241
Other comprehensive income (loss) | (17,605,240) |  |  |  |  | (17,502,133) | (103,107)
Share-based compensation | 2,702,089 |  |  | 2,702,089 |  |  |
Options exercised | 1,051,586 | $ 212 |  | 1,051,374 |  |  |
Options exercised, shares |  | 2,119,700 |  |  |  |  |
Balance at Dec. 31, 2016 | 271,728,922 | $ 26,532 | (1,748,836) | 240,111,533 | 40,432,352 | (8,721,820) | 1,629,161
Balance, shares at Dec. 31, 2016 |  | 262,956,278 |  |  |  |  |
Net income | 93,855,400 |  |  |  | 92,841,128 |  | 1,014,272
Other comprehensive income (loss) | 21,978,054 |  |  |  |  | 21,829,007 | 149,047
Share-based compensation | 4,200,273 |  |  | 4,200,273 |  |  |
Options exercised | $ 2,765,418 | $ 560 |  | 2,764,858 |  |  |
Options exercised, shares | 5,596,050 | 5,596,050 |  |  |  |  |
Restricted shares vested |  | $ 236 |  | (236) |  |  |
Restricted shares vested, shares |  | 2,366,374 |  |  |  |  |
Balance at Dec. 31, 2017 | $ 394,528,067 | $ 27,328 | $ (1,748,836) | $ 247,076,428 | $ 133,273,480 | $ 13,107,187 | $ 2,792,480
Balance, shares at Dec. 31, 2017 |  | 270,918,702 |  |  |  |  |

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