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Income taxes - Effective Income Tax Benefit Differed from Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	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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