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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, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Tax on continuing operating loss before income taxes	$ (14,663)	$ (20,117)	$ (264)
Effect of state taxes (net of federal tax benefit)	(1,645)	(1,800)	(7)
Non-deductible contingent earn out costs		4,862
Non-deductible acquisition costs	433	366	101
Other permanent differences	124	185	3
Others	(172)	(79)
Valuation allowance	1,881
Income tax benefit	$ (14,042)	$ (16,583)	$ (167)
Tax on continuing operating loss before income taxes	34.00%	34.00%	34.00%
Effect of state taxes (net of federal tax benefit)	3.80%	3.00%	0.90%
Non-deductible contingent earn out costs	0.00%	(8.20%)	0.00%
Non-deductible acquisition costs	(1.00%)	(0.60%)	(13.00%)
Other permanent differences	(0.30%)	(0.30%)	(0.40%)
Others	0.40%	0.10%	0.00%
Valuation allowance	(4.40%)	0.00%	0.00%
Income tax benefit	32.50%	28.00%	21.50%

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to acquisition costs.

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