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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 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 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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