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Leases - Narrative (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
renewal_term
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease right-of-use assets $ 34.6 $ 26.7
Finance lease right-of-use asset   15.3
Operating lease liabilities 49.3 40.4
Finance lease liability $ 15.1 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 and land    
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 0  
Leased square footage under sublease | ft² 132,600  
Leased square footage without option for renewal | ft² 87,000  
Leased Buildings -6340 Sequence Drive, 6310 Sequence Drive, 6290 Sequence drive    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
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