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Sale of Intellectual Property - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Revenue - other |  | $ 4,469 | $ 2,043 |  | $ 11,827 | $ 7,215
Revenue - other |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Revenue - other |  |  |  |  | $ 53 | $ 2,302
Intellectual property |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Proceeds from royalties | $ 600 |  |  |  |  |
Intellectual property | Revenue - other |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Revenue - other |  |  |  | $ 600 |  |

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