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Income taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 7,555 | $ 8,041
Share-based compensation | 16,321 | 21,503
Accounts receivable | 480 | 392
Accrued expenses and other current liabilities | 1,128 | 43
Others | 22 | 11
Deferred Tax Assets, Gross, Total | 25,506 | 29,990
Valuation allowance | (10,853) | (1,881)
Deferred tax assets, net of valuation allowance | 14,653 | 28,109
Deferred tax liabilities: |  |
Intangible assets | 14,505 | 27,962
Property and equipment | 148 | 117
Internal Revenue Code Sec. 481 adjustment |  | 30
Deferred Tax Liabilities, Gross, Total | $ 14,653 | $ 28,109

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