Income Taxes (Details 2)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of reconciliation of Effective income tax rate and statutory federal income tax rate
Amounts at statutory tax rates	34.00%	34.00%	34.00%
Federal tax reform - deferred rate change	(170.00%)
Accounting method adoption	11.00%
Foreign losses taxed at different rates	(7.00%)	(3.00%)
Foreign withholding tax	1.00%	(4.00%)
Stock-based compensation			(1.00%)
Other	(1.00%)		(1.00%)
Total	(132.00%)	27.00%	31.00%
Valuation allowance	133.00%	(35.00%)	(32.00%)
Effective tax rate	1.00%	(8.00%)	(1.00%)

Effective income tax rate reconciliation accounting method adoption.

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Effective income tax rate reconciliation before valuation allowance.

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Effective income tax rate reconciliation federal tax reform deferred rate change.

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Effective income tax rate reconciliation foreign losses at different rates.

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Effective income tax rate reconciliation foreign withoutholding tax.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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