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Commitments and Contingencies (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jul. 22, 2015
USD ($)
May 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 01, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
ft²
Oct. 31, 2015
USD ($)
Commitments and Contingencies [Line Items]                  
Operating lease right-of-use assets, net     $ 32,827,000         $ 35,500,000  
Rent payments     7,000,000            
Operating lease cost     6,200,000            
Long-term restricted cash     4,000,000 $ 4,500,000   $ 4,000,000     $ 4,500,000
Rent expense     6,200,000 $ 6,200,000 $ 6,300,000        
Other purchase commitments     15,500,000            
Additional liability associated with indemnification obligations     $ 0            
1305 O’Brien Drive, Menlo Park, California [Member]                  
Commitments and Contingencies [Line Items]                  
Net rentable area | ft²               180,000  
Operating lease right-of-use assets, net             $ 35,500,000 $ 35,300,000  
Renewal term     5 years            
Weighted average remaining lease term     7 years 9 months 18 days            
Weighted average discount rate     7.90%            
Singapore and Engineering Support Facilities in Allen, Texas [Member]                  
Commitments and Contingencies [Line Items]                  
Operating lease right-of-use assets, net               $ 200,000  
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                
Long-term restricted cash           $ 4,000,000     $ 4,500,000
O’Brien Lease Agreement [Member] | Prime Rate [Member]                  
Commitments and Contingencies [Line Items]                  
Basis spread on variable rate 2.00%                
Forecast [Member]                  
Commitments and Contingencies [Line Items]                  
Long-term restricted cash   $ 3,500,000              
Decrease in Long-term restricted cash   $ 500,000