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Long-Term Debt - Schedule of Net Carrying Amount of Liability Component of Notes (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Debt Instrument, Face Amount $ 345,000 $ 300,000  
Debt Instrument, Unamortized Discount, Noncurrent (61,234)    
Debt Issuance Costs, Net (7,108)   $ (772)
Convertible Notes Payable, Noncurrent $ 276,658