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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue | $ 171,977 | $ 168,947 | $ 166,898 | $ 76,530 | $ 72,939 | $ 71,089 | $ 67,372 | $ 65,271 | $ 584,352 | $ 276,671 | $ 263,937
Gross profit | 116,430 | 104,638 | 109,365 | 39,195 | 38,291 | 39,422 | 37,025 | 36,729 |  |  |
Net loss | $ (2,003) | $ (12,751) | $ (8,857) | $ (23,370) | $ (232,216) | $ (12,355) | $ (9,715) | $ (10,448) | $ (10,551) | $ (264,734) | $ (26,944)
Common units |  |  |  |  |  |  |  |  |  |  |
Basic and diluted net loss per common unit and Class B Unit (in dollars per unit) | $ 0.010 | $ (0.10) | $ (0.060) |  |  |  |  |  | $ (0.43) |  |
Class B Units |  |  |  |  |  |  |  |  |  |  |
Basic and diluted net loss per common unit and Class B Unit (in dollars per unit) | $ (0.51) | $ (0.62) | $ (0.58) |  |  |  |  |  | $ (2.33) |  |

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