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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018 | May 01, 2018
Class of Stock [Line Items] |  |  |  |  |
Additional shares issued | 266,410 | 213,276 |  |  |
Shelf Registration [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Additional shares issued |  |  | 0 |  |
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of shares related to acquisition |  |  |  | 163,137 |
Common Class A [Member] | Equity Distribution Agreement [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares sold |  |  | 842,412 |  |
Common stock, shares available to be sold | $ 336,668 |  | $ 336,668 |  |
Common Class A [Member] | Maximum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Aggregate offering price of common stock issuable |  |  |  |  | $ 400,000

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