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Balance Sheet Components (Narrative) (Details)
 1 Months Ended 3 Months Ended
Jan. 02, 2020
USD ($)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
May 01, 2019
USD ($)
Oct. 31, 2015
USD ($)
Balance Sheet Components [Line Items]                  
Long-term restricted cash       $ 4,000,000 $ 4,500,000   $ 4,000,000 $ 4,000,000.0 $ 4,500,000
Termination fee received $ 98,000,000.0                
Accrued advisor fees       $ 6,000,000.0          
Period in which company must repay continuation advances if change-of-controll transaction is entered into with third party       2 years          
Deferred gain from Reverse Termination Fee       $ 98,000,000          
Sales, general and administrative       24,947,000 $ 19,766,000        
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     $ 0        
Deferred revenue, current       7,107,000     7,610,000    
Deferred revenue, non-current       1,484,000     1,951,000    
Prepaid expenses and other current assets       3,490,000     3,369,000    
Service [Member]                  
Balance Sheet Components [Line Items]                  
Deferred revenue       8,600,000          
Deferred revenue, current       7,100,000     $ 2,900,000    
Deferred revenue, non-current       1,500,000          
Prepaid expenses and other current assets       $ 500,000          
Service [Member] | Minimum [Member]                  
Balance Sheet Components [Line Items]                  
Deferred service revenue, noncurrent, recognition period       3 years          
Forecast [Member]                  
Balance Sheet Components [Line Items]                  
Decrease in Long-term restricted cash   $ 500,000              
Termination Agreement [Member]                  
Balance Sheet Components [Line Items]                  
Sales, general and administrative       $ 6,000,000.0          
Subsequent Event [Member]                  
Balance Sheet Components [Line Items]                  
Long-term restricted cash           $ 3,500,000      
Measurement Input, Discount Rate [Member]                  
Balance Sheet Components [Line Items]                  
Derivative liability, measurement input | item             0.065