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Organization and Summary of Significant Accounting Policies - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Cash and cash equivalents $ 140,418 $ 49,826
Restricted cash 3,500 3,500
Total cash, cash equivalents, and restricted cash $ 143,918 $ 53,326