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Capitalization - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Warrants      
Stock issued (in shares) 7,563,725    
Share price (in dollars per share) $ 30.20    
Net proceeds from public offerings $ 224,500 $ 224,545 $ 117,874
Over-Allotment Option      
Warrants      
Stock issued (in shares) 843,725