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Deferred Tax Liability, Net (Details) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥)
--- | --- | --- | --- | ---
Summary of deferred tax liability |  |  |  |
Deferred tax asset - current (accrual of employee social insurance) | $ 180,107 |  | $ 189,617 |
Deferred tax liability - current (net investment in sales-type leases) | (1,990,054) |  | (1,828,246) |
Deferred tax liability, net of current deferred tax asset | (1,809,947) |  | (1,638,629) |
Deferred tax asset - noncurrent (depreciation of fixed assets) | 15,604,443 |  | 17,709,919 |
Deferred tax asset - noncurrent (asset impairment loss) | 1,209,848 |  | 450,706 |
Deferred tax asset - noncurrent (interest income receivable in sales-type leases) | 442,949 |  |  |
Deferred tax asset-noncurrent | 14,688,731 | ¥ 8,870,766 | 14,321,617 |
Less: valuation allowance on deferred tax assets | (23,559,497) |  | (14,321,617) |
Deferred tax assets --- noncurrent, net | 17,257,240 |  | 18,160,625 |
Deferred tax liability - noncurrent (net investment in sales-type leases) | (22,384,308) |  | (25,157,147) |
Deferred tax liability, net of noncurrent deferred tax asset | (5,127,068) |  | (6,996,522) |
Total Deferred tax liability, noncurrent per ASU 2015-17 | $ (6,937,015) |  | $ (8,635,151) |

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