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Income taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Net operating loss carryforwards	$ 36,973
Limitation resulting in disallowed interest	8,417
Deferred tax assets, net	1,500
Operating loss carryforward, subject to expiration	26,128
Operating loss carryforward, not subject to expiration	10,845
Valuation allowance	5,238	$ 10,853
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards	$ 36,075

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- Definition

Income taxes.

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Tax Act and Jobs Cut 2017, Limitation on Deductible Interest Expense, Disallowed Interest

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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