XML 23 R32.htm IDEA: XBRL DOCUMENT v3.20.1
Commitments and Contingencies (Narrative) (Details)
ft² in Thousands
3 Months Ended
Jul. 22, 2015
USD ($)
Mar. 31, 2020
USD ($)
ft²
Mar. 31, 2019
USD ($)
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
May 01, 2019
USD ($)
Oct. 31, 2015
USD ($)
Commitments and Contingencies [Line Items]              
Long-term restricted cash   $ 4,000,000 $ 4,500,000   $ 4,000,000 $ 4,000,000.0 $ 4,500,000
Rent payments   1,800,000          
Operating lease cost   1,600,000 $ 1,600,000        
Additional liability associated with indemnification obligations   $ 0          
1305 O’Brien Drive, Menlo Park, California [Member]              
Commitments and Contingencies [Line Items]              
Net rentable area | ft²   180          
Renewal term   5 years          
Weighted average remaining lease term   7 years 7 months 6 days          
Weighted average discount rate   7.90%          
Subsequent Event [Member]              
Commitments and Contingencies [Line Items]              
Long-term restricted cash       $ 3,500,000      
O’Brien Lease Agreement [Member]              
Commitments and Contingencies [Line Items]              
Lease term 132 months            
Rent expense first twelve months $ 540,000            
Rent expense last twelve months $ 711,000            
Period in which payment must be received without incurring late charge 5 days            
Late charge, percent 5.00%            
Amount not paid after written notice, bear interest from date due until date paid, period 10 days            
O’Brien Lease Agreement [Member] | Prime Rate [Member]              
Commitments and Contingencies [Line Items]              
Basis spread on variable rate 2.00%