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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 01, 2016 | Dec. 31, 2013
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ (213,875,000) |  |  |  | $ (101,488,000) |  |  |  | $ (213,875,000) | $ (101,488,000) |  |  |
Net loss | (31,276,000) | $ (29,031,000) | $ (28,613,000) | $ (23,467,000) | (17,000,000) | $ (18,126,000) | $ 9,007,000 | $ (3,502,000) | $ (112,387,000) | (29,621,000) | $ (3,214,000) |  |
Cash and cash equivalents original maturity dates |  |  |  |  |  |  |  |  | 90 days or less |  |  |  |
Short-term investments maturity period description |  |  |  |  |  |  |  |  | Short-term investments consist of debt securities classified as available-for-sale and have maturities greater than 90 days, but less than 365 days from the date of acquisition. |  |  |  |
Impairment loss of long lived assets |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  |  | (29,000) | 67,000 |  |
Unrecognized excess tax benefit | $ 3,892,000 |  |  |  | $ 3,298,000 |  |  |  | 3,892,000 | $ 3,298,000 | $ 2,815,000 |  | $ 1,411,000
ASU 2016-09 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |
Unrecognized excess tax benefit |  |  |  |  |  |  |  |  |  |  |  | $ 700,000 |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives |  |  |  |  |  |  |  |  | 5 years |  |  |  |

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