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Income taxes - Effective Income Tax Benefit Differed from Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Income tax expense at federal statutory rate | $ (3,756) | $ (18,090)
Share-based compensation shortfall | 7,080 | 5,133
Effect of state taxes, net of federal tax benefit | 64 | (1,515)
Deferred remeasurement for tax rate change | 0 | 5,117
Loss on amendment of warrants | 0 | 342
Non-deductible items | 396 | 0
Return to provision adjustment | (4) | 0
Other | 27 | 41
Change in valuation allowance | (3,761) | 8,972
Income tax expense | $ 46 | $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Income tax expense at federal statutory rate | 21.00% | 34.00%
Share-based compensation shortfall | (39.60%) | (9.60%)
Effect of state taxes, net of federal tax benefit | (0.40%) | 2.80%
Deferred remeasurement for tax rate change | 0.00% | (9.60%)
Loss on amendment of warrants | 0.00% | (0.60%)
Non-deductible items | (2.30%) | 0.00%
Return to provision adjustment | 0.20% | 0.00%
Other | 0.20% | (0.10%)
Change in valuation allowance | 21.00% | (16.90%)
Income tax expense | 0.10% | 0.00%

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