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Balance Sheet Details - Short-term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost Basis $ 0 $ 8,233
Unrealized Gains   42
Fair Value   8,275
Fixed income debt securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost Basis   8,233
Unrealized Gains   42
Fair Value   $ 8,275