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Financial Statement Details - Summary of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 18,836 $ 21,198 $ 8,855 $ 9,894
Restricted cash 61 61 2,511 0
Total cash, cash equivalents and restricted cash $ 18,897 $ 21,259 $ 11,366 $ 9,894