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Deferred Tax Liability, Net (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Summary of deferred tax liability    
Deferred tax asset - current (accrual of employee social insurance) $ 160,551 $ 98,372
Deferred tax liability - current (net investment in sales-type leases) (1,218,774) (1,636,477)
Deferred tax liability, net of deferred tax asset - current (1,058,223) (1,538,105)
Deferred tax asset - noncurrent (depreciation of fixed assets) 18,819,435 22,498,560
Deferred tax liability - noncurrent (net investment in sales-type leases) (27,965,148) (33,269,908)
Deferred tax liability, net of deferred tax asset - noncurrent $ (9,145,713) $ (10,771,348)