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Organization and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle        
Proceeds received from grant $ 20,600 $ 20,600    
Liability related to proceeds received from grant 3,400      
Deferred payroll taxes under CARES Act 7,100      
Cumulative effect on accumulated deficit $ (310,068)     $ (331,951)
ASU 2016-13 | Restatement Adjustments        
New Accounting Pronouncements or Change in Accounting Principle        
Cumulative effect on accumulated deficit     $ 200