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Deferred Tax Liability, Net (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Summary of deferred tax liability |  |
Deferred tax asset - current (accrual of employee social insurance) | $ 167,980 | $ 98,372
Deferred tax liability - current (net investment in sales-type leases) | (1,586,058) | (1,636,477)
Deferred tax liability, net of deferred tax asset - current | (1,418,078) | (1,538,105)
Deferred tax asset - noncurrent (depreciation of fixed assets) | 17,943,843 | 22,498,560
Deferred tax liability - noncurrent (net investment in sales-type leases) | (25,426,744) | (33,269,908)
Deferred tax liability, net of deferred tax asset - noncurrent | $ (7,482,901) | $ (10,771,348)

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