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Fair Value Measurements - Transfers (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Jun. 11, 2020
Jun. 30, 2019
Fair Value Measurements, Valuation      
Amount of transfers of assets and liabilities measured on a recurring basis between Levels 1, 2 and 3 of the fair value hierarchy $ 0   $ 0
2.75% Convertible Senior Notes due 2027      
Fair Value Measurements, Valuation      
Interest rate (as a percent) 2.75% 2.75%  
Fair value of convertible senior notes $ 277,900