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 6 Months Ended
Nov. 21, 2017
USD ($)
Facility
Dec. 19, 2016
Employee
Jun. 30, 2018
USD ($)
Facility
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Facility
Subtenant
Jun. 30, 2017
USD ($)
Employee
Apr. 14, 2018
Facility
Restructuring Cost And Reserve [Line Items]              
Operating leases, number of leased facilities | Facility 3           3
Operating leases, number of subtenants | Subtenant         2    
Operating leases, loss on sublease $ 800            
Restructuring credit     $ 459 $ 1,460 $ 459 $ 3,480  
Restructuring Charges [Member]              
Restructuring Cost And Reserve [Line Items]              
Operating leases, loss on sublease     600   600    
Lease-related Costs [Member]              
Restructuring Cost And Reserve [Line Items]              
Restructuring credit     100   100    
Restructuring liability     400   400    
Reversal of deferred rent liability         600    
Lease-related Costs [Member] | Accrued and Other Liabilities [Member]              
Restructuring Cost And Reserve [Line Items]              
Combined lease-related liabilities, current portion     400   400    
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   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