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Stock-Based Compensation - 2016 Market-Based RSAs and RSUs (Details) - 2016 Market-Based RSAs and RSUs - USD ($) $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Jan. 14, 2016 | Feb. 28, 2018 | Sep. 30, 2018 | Mar. 31, 2018
Market-Based RSAs and RSUs |  |  |  |
Stock-based compensation |  |  |  |
Reversal of previously recognized compensation expense |  |  | $ 0.2 |
Market-Based RSAs and RSUs | Released on February 20, 2018 |  |  |  |
Stock-based compensation |  |  |  |
Vesting percentage |  | 66.70% |  |
Market-Based RSAs |  |  |  |
Stock-based compensation |  |  |  |
Forfeited (in shares) |  |  | 34,722 |
Market-Based RSAs | Released on February 20, 2018 |  |  |  |
Stock-based compensation |  |  |  |
Exercised (in shares) |  | 69,440 |  |
Market-Based RSAs | Senior Management |  |  |  |
Stock-based compensation |  |  |  |
Granted (in shares) | 282,394 |  |  |
Vested (in shares) |  | 118,821 |  |
Stock-based compensation, net |  |  |  | $ 0.7
Forfeited (in shares) |  | 59,411 |  |
Market-Based RSUs |  |  |  |
Stock-based compensation |  |  |  |
Forfeited (in shares) |  |  | 15,432 |
Market-Based RSUs | Released on February 20, 2018 |  |  |  |
Stock-based compensation |  |  |  |
Exercised (in shares) |  | 30,862 |  |
Market-Based RSUs | Senior Management |  |  |  |
Stock-based compensation |  |  |  |
Granted (in shares) | 46,294 |  |  |

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