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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. 22, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Tax on continuing operating loss before income taxes		$ (18,090)	$ (14,663)	$ (20,117)
Effect of state taxes (net of federal tax benefit)		(1,515)	(1,645)	(1,800)
Share-based compensation tax deficiencies		5,133
Loss on amendments of warrants		342	433
Contingent earn-out costs				4,862
Others		41	(48)	472
Deferred remeasurement for tax rate change		5,117
Valuation allowance		$ 8,972	1,881
Income tax benefit			$ (14,042)	$ (16,583)
Tax on continuing operating loss before income taxes	21.00%	34.00%	34.00%	34.00%
Effect of state taxes (net of federal tax benefit)		2.80%	3.80%	3.00%
Share-based compensation tax deficiencies		(9.60%)
Loss on amendments of warrants		(0.60%)	(1.00%)
Contingent earn-out costs				(8.20%)
Others		(0.10%)	0.10%	(0.80%)
Deferred remeasurement for tax rate change		(9.60%)
Valuation allowance		(16.90%)	(4.40%)
Income tax benefit			32.50%	28.00%

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