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Capitalization - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Warrants |  |  |
Stock issued (in shares) | 7,563,725 |  |
Share price (in dollars per share) | $ 30.20 |  |
Net proceeds from public offerings | $ 224,400 | $ 224,441 | $ 0
Over-Allotment Option |  |  |
Warrants |  |  |
Stock issued (in shares) | 843,725 |  |

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