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Summary of Significant Accounting Policies - Reconciliation 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 $ 19,409 $ 22,553    
Restricted cash 1,458 1,448    
Total cash, cash equivalents and restricted cash $ 20,867 $ 24,001 $ 22,744 $ 28,236