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Leases - Narrative (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2019
USD ($)
ft²
renewal_term
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 35.8 $ 26.7 $ 0.0
Finance lease right-of-use asset   15.3  
Operating lease liabilities 51.8 40.4  
Finance lease liability $ 15.2 15.9  
Accumulated Deficit | Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative-effect adjustment to retained earnings   $ 2.1  
Building      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Leased square footage | ft² 87,000    
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term 0    
Leased Buildings -6350 Sequence Drive      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Leased square footage | ft² 132,600    
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Leased square footage | ft² 219,000    
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term 2    
Leased Buildings -232 South Dobson Road      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Leased square footage | ft² 148,800    
Lessee leasing arrangements, operating leases, number of renewal terms | renewal_term 4    
Lessee, operating lease, renewal term 5 years