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Other Balance Sheet Accounts Details - Purchased Intangible Assets, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost $ 7,986 $ 7,986
Accumulated Amortization (7,124) (5,681)
Net 862 2,305
Developed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost 5,050 5,050
Accumulated Amortization (4,545) (3,535)
Net 505 1,515
Patents    
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost 2,936 2,936
Accumulated Amortization (2,579) (2,146)
Net $ 357 $ 790