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Financial Statement Details - Summary of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 31,547 $ 21,198 $ 19,587 $ 9,894
Restricted cash 61 61 411 0
Total cash, cash equivalents and restricted cash $ 31,608 $ 21,259 $ 19,998 $ 9,894