Quarterly report pursuant to Section 13 or 15(d)

Lease Agreements - Leased facilities (Details)

v3.20.1
Lease Agreements - Leased facilities (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
facility
Dec. 31, 2019
USD ($)
Dec. 17, 2019
facility
Dec. 18, 2019
facility
Leased facilities, Berkeley, California        
Leases        
Operating leases, number of leased facilities     2  
Number of operating leases terminated early       2
Early termination fee | $   $ 1.6    
Lease termination loss | $   $ 0.4    
Leased facilities, Emeryville, California        
Leases        
Operating leases, number of leased facilities 1