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Convertible Notes (Details) - Convertible Notes
$ / shares in Units, $ in Thousands
1 Months Ended
Oct. 31, 2018
USD ($)
D
$ / shares
$ / EquityInstruments
Convertible Notes  
Gross proceeds from Convertible Notes | $ $ 201,250
Percentage of interest rate per annum 1.00%
Conversion ratio 0.0236323
Conversion price per share | $ / shares $ 42.31
Percentage of redemption price 100.00%
Threshold percentage of stock price trigger 130.00%
Threshold trading days 20
Threshold consecutive trading days 30
Call option  
Convertible Notes  
Derivative cap price (in dollars per share) | $ / EquityInstruments 65.10