Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Significant Accounting Policies - Leases (Details)

v3.20.1
Basis of Presentation and Significant Accounting Policies - Leases (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
facility
Dec. 31, 2018
USD ($)
Accounting Policies      
Lease, Practical Expedients, Package true    
Operating lease right-of-use assets   $ 510  
Operating lease liabilities   $ 573  
Lease-related Costs      
Accounting Policies      
Restructuring liability     $ 1,700
ASC 842      
Accounting Policies      
Change in Accounting Principle, Accounting Standards Update, Adopted true    
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated true    
ASC 842 | Restatement Adjustment      
Accounting Policies      
Operating lease right-of-use assets $ 7,400    
Operating lease liabilities $ 9,200    
Leased facilities, Emeryville, California      
Accounting Policies      
Operating leases, number of leased facilities | facility   1