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Commitments and Contingencies - Additional Information (Details)
$ in Millions
1 Months Ended
Aug. 31, 2017
USD ($)
ft²
Oct. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Oct. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]        
Total operating lease obligations   $ 2.0    
Lease term 7 years      
Area of leased office space (in sqft) | ft² 45,831      
Base rent obligation $ 32.2      
Outstanding letters of credit $ 2.6   $ 7.7 $ 9.6