Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Schedule of Reconciliation of Cash And Restricted Cash (Details)

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Basis of Presentation and Significant Accounting Policies - Schedule of Reconciliation of Cash And Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash $ 8,571 $ 2,723 $ 1,249  
Restricted cash 50 29 29  
Total cash and restricted cash shown in the statements of cash flows $ 8,621 $ 2,752 $ 1,278 $ 777