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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