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Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 23,103 $ 22,553    
Restricted cash 1,468 1,448    
Total cash, cash equivalents and restricted cash $ 24,571 $ 24,001 $ 29,970 $ 28,236