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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
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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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