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Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Deferred tax assets, Net operating loss carryforwards | $ 841 | $ 761
Deferred tax assets, Tax credits | 1,839 | 1,520
Deferred tax assets, Intangible assets | 0 | 10
Deferred tax assets, Deferred revenue adjustment | 543 | 1,214
Deferred tax assets, Accrued Compensation | 6,519 | 2,863
Share-based compensation expense | 12,987 | 11,597
Deferred tax assets, Deferred rent | 1,764 | 0
Deferred tax assets, Other | 2,115 | 2,457
Deferred tax assets before valuation allowance | 26,608 | 20,422
Deferred tax assets, Valuation allowance | (1,507) | (1,015)
Deferred tax assets, net of valuation allowance | 25,101 | 19,407
Deferred tax liabilities, Prepaid expenses and other | 1,049 | 1,301
Deferred tax liabilities, Property and equipment | 5,841 | 6,778
Deferred tax liabilities, Capitalized software development costs | 0 | 695
Method change | 932 | 1,340
Total deferred tax liabilities | 7,822 | 10,114
Total net deferred tax asset | 17,279 | 9,293
Non-current deferred tax assets, net | 17,316 | 9,297
Non-current deferred tax liabilities | $ (37) | $ (4)

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