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Income taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 8,041 $ 4,619
Share-based compensation 21,503 12,069
Liability for employee incentive-based compensation plan   1,528
Accounts receivable 392 530
Accrued expenses and other current liabilities 43 136
Others 11  
Deferred Tax Assets, Gross, Total 29,990 18,882
Valuation allowance (1,881)  
Deferred tax assets, net of valuation allowance 28,109 18,882
Deferred tax liabilities:    
Intangible assets 27,962 31,743
Property and equipment 117 239
Prepaid expenses and other current assets   412
Internal Revenue Code Sec. 481 adjustment 30 61
Deferred Tax Liabilities, Gross, Total $ 28,109 32,455
Net deferred tax liability   $ (13,573)