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Income Taxes - Schedule of Provision for Tax Differed from Amounts Computed by Applying U.S. Federal Income Tax Rate to Pretax Income (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation And Amortization [Abstract]
Federal tax at statutory rate	34.00%	34.00%	34.00%
Stock-based compensation	(0.50%)	(1.90%)	(9.50%)
Change in valuation allowance	(16.80%)	(31.10%)	190.60%
Foreign rate differential	(1.30%)	0.00%	0.00%
Preferred stock warrant revaluation	(0.20%)	0.00%	(0.70%)
Interest expense	0.00%	0.00%	(5.80%)
Contingent liability for IMX acquisition	0.40%	(0.00%)	38.20%
Acquisition costs	(1.20%)	(3.20%)	(36.70%)
Goodwill impairment	(10.80%)	0.00%	0.00%
Other	0.30%	2.20%	(1.30%)
Effective income tax rate	3.90%	0.00%	208.80%

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Effective income tax rate reconciliation acquisition costs.

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Effective income tax rate reconciliation interest expense.

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Effective income tax rate reconciliation, Liability contingent for unconsolidated subsidiary, percent.

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Effective income tax rate reconciliation, preferred stock 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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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 impairment 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 equity-based compensation costs.

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