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Balance Sheet Components (Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 02, 2020
USD ($)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
May 01, 2019
USD ($)
Mar. 31, 2019
USD ($)
Oct. 31, 2015
USD ($)
Balance Sheet Components [Line Items]                        
Long-term restricted cash       $ 3,500,000   $ 3,500,000   $ 3,500,000 $ 4,000,000 $ 4,000,000.0 $ 4,500,000 $ 4,500,000
Decrease in Long-term restricted cash   $ 500,000                    
Termination fee received $ 98,000,000.0                      
Accrued advisor fees       6,000,000.0   6,000,000.0            
Sales, general and administrative       14,772,000 $ 20,066,000 $ 54,846,000 $ 58,915,000          
Period in which company must repay continuation advances if change-of-control transaction is entered into with third party           2 years            
Deferred gain from Reverse Termination Fee       98,000,000   $ 98,000,000            
Notes payable, current                 16,000,000.0      
Repayment of notes payable     $ 16,000,000.0     16,000,000            
Fair value of the financing derivative                 0      
Financing derivative                  
Deferred revenue, current       6,982,000   6,982,000     7,610,000      
Deferred revenue, non-current       1,761,000   1,761,000     1,951,000      
Revenue       19,082,000 $ 21,915,000 51,757,000 $ 62,961,000          
Prepaid expenses and other current assets       3,212,000   3,212,000     $ 3,369,000      
Service [Member]                        
Balance Sheet Components [Line Items]                        
Deferred revenue       8,700,000   8,700,000            
Deferred revenue, current       6,900,000   6,900,000            
Deferred revenue, non-current       1,800,000   1,800,000            
Revenue       1,600,000   6,500,000            
Prepaid expenses and other current assets       $ 600,000   $ 600,000            
Service [Member] | Minimum [Member]                        
Balance Sheet Components [Line Items]                        
Deferred service revenue, noncurrent, recognition period           3 years            
Termination Agreement [Member]                        
Balance Sheet Components [Line Items]                        
Sales, general and administrative           $ 6,000,000.0            
Measurement Input, Discount Rate [Member]                        
Balance Sheet Components [Line Items]                        
Derivative liability, measurement input | item                 0.065