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Condensed Consolidated Financial Statement Details - Purchased Intangible Assets, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost $ 7,986 $ 7,986
Accumulated Amortization (5,320) (4,238)
Total 2,666 3,748
Developed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost 5,050 5,050
Accumulated Amortization (3,282) (2,525)
Total 1,768 2,525
Patents    
Acquired Finite-Lived Intangible Assets [Line Items]    
Cost 2,936 2,936
Accumulated Amortization (2,038) (1,713)
Total $ 898 $ 1,223