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Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Cash and cash equivalents $ 19,946 $ 18,017    
Restricted cash 1,325 1,444    
Total cash, cash equivalents and restricted cash $ 21,271 $ 19,461 $ 24,571 $ 24,001