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Commitments and Contingencies - Leases (Details)
 12 Months Ended
Nov. 14, 2018
ft²
item
Jan. 01, 2017
USD ($)
Dec. 31, 2018
USD ($)
ft²
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Operating Leases          
Rent expense     $ 1,600,000 $ 1,500,000 $ 1,100,000
Future minimum lease payments under noncancelable operating leases          
2019     1,719,000    
2020     2,929,000    
2021     6,376,000    
2022     6,496,000    
2023     6,842,000    
Thereafter     50,005,000    
Total future minimum payments     74,367,000    
Loss contingency accrual          
Accrual for loss contingency     0    
Purchase commitments          
Purchase commitment due after one year     3,400,000    
Facilities Leases          
Operating Leases          
Deferred rent     $ 500,000 $ 300,000  
Domestic Office Leases          
Operating Leases          
The number of adjacent facilities rented | item     2    
Extended lease term     3 years    
Number of lease renewal periods | item     1    
Optional lease extension term     3 years    
Area of leased space | ft²     98,000    
Domestic Office Leases | Maximum          
Operating Leases          
Tenant improvement allowance   $ 300,000      
Foreign Subsidiaries Office Leases          
Operating Leases          
Area of leased space | ft²     14,000    
Aliso Facility          
Operating Leases          
Number of properties leased | item 1        
Number of buildings leased | item 3        
Number of lease renewal periods | item 2        
Optional lease extension term 5 years        
Area of leased space | ft² 160,000        
Term of lease 13 years