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Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Deferred tax assets, Net operating loss carryforwards | $ 761 | $ 214
Deferred tax assets, Tax credits | 1,520 | 1,372
Deferred tax assets, Intangible assets | 10 | 11
Deferred tax assets, Deferred revenue adjustment | 3,351 | 3,305
Deferred tax assets, Accrued Compensation | 2,863 | 7,866
Share-based compensation expense | 11,597 | 11,440
Deferred tax assets, Deferred rent | 0 | 1,281
Deferred tax assets, Other | 2,457 | 2,002
Deferred tax assets before valuation allowance | 22,559 | 27,491
Deferred tax assets, Valuation allowance | (1,015) | (832)
Deferred tax assets, net of valuation allowance | 21,544 | 26,659
Deferred tax liabilities, Prepaid expenses and other | 684 | 1,098
Deferred tax liabilities, Property and equipment | 6,778 | 10,821
Deferred tax liabilities, Capitalized software development costs | 695 | 3,330
Total deferred tax liabilities | 8,157 | 15,249
Total net deferred tax asset | 13,387 | 11,410
Non-current deferred tax assets, net | 13,391 | 11,704
Non-current deferred tax liabilities | $ (4) | $ (294)

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