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% |