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Income Taxes - Summary of Effective Tax Rate of Provision For Income Taxes Differs From Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	34.00%	34.00%	34.00%
State taxes, net of federal benefit	6.50%	(2.70%)	4.10%
Warrant revaluation	(4.30%)	(0.20%)	(5.50%)
Foreign tax rate difference	(1.60%)	(11.80%)	(6.80%)
Change in valuation allowance	(36.00%)	(19.90%)	(26.50%)
Other	1.40%	0.60%	0.70%
Provision for income taxes	0.00%	0.00%	0.00%

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Effective income tax rate reconciliation warrant revaluation.

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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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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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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 applicable to statutory income tax expense (benefit) outside of the country of domicile.

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