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Income taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 8,908 | $ 7,555
Share-based compensation | 5,753 | 16,321
Interest expense limitation | 2,171 | 0
Settlement liability | 0 | 1,037
Accounts receivable, net | 451 | 480
Accrued expenses and other current liabilities | 74 | 91
Property and equipment, net | 73 | 0
Other | 145 | 22
Deferred tax assets, gross | 17,575 | 25,506
Valuation allowance | (5,238) | (10,853)
Deferred tax assets, net of valuation allowance | 12,337 | 14,653
Deferred tax liabilities: |  |
Intangible assets | (12,383) | (14,505)
Property and equipment, net | 0 | (148)
Deferred tax liabilities, gross | (12,383) | (14,653)
Net deferred tax liability | $ (46) | $ 0

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