Quarterly report pursuant to Section 13 or 15(d)

Restructuring Charges - Additional Information (Details)

v3.10.0.1
Restructuring Charges - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Facility
Subtenant
Dec. 19, 2016
Employee
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Employee
Apr. 14, 2018
Facility
Nov. 21, 2017
Facility
Restructuring Cost And Reserve [Line Items]                
Operating leases, number of leased facilities | Facility             3 3
Operating leases, number of subtenants | Subtenant 2              
Restructuring charges (credit)     $ 909 $ (29) $ 1,368 $ 3,451    
Restructuring Charges [Member]                
Restructuring Cost And Reserve [Line Items]                
Operating leases, loss on sublease $ 600              
Lease-related Costs [Member]                
Restructuring Cost And Reserve [Line Items]                
Restructuring charges (credit) (100)   800   100      
Restructuring liability 400   1,000   1,000      
Reversal of deferred rent liability $ 600   200   200      
Lease-related Costs [Member] | Accrued and Other Liabilities [Member]                
Restructuring Cost And Reserve [Line Items]                
Combined lease-related liabilities, current portion     1,300   1,300      
Lease-related Costs [Member] | Other Liabilities Non-current [Member]                
Restructuring Cost And Reserve [Line Items]                
Combined lease-related liabilities, non-current portion     $ 500   $ 500      
Berkeley, California [Member]                
Restructuring Cost And Reserve [Line Items]                
Operating leases, number of leased facilities | Facility 2              
Operating leases, number of leased facilities vacated | Facility 1              
2016 Restructuring [Member]                
Restructuring Cost And Reserve [Line Items]                
Number of employees terminated | Employee   57            
2017 Restructuring [Member]                
Restructuring Cost And Reserve [Line Items]                
Number of employees terminated | Employee           5