Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reconciliation of cash (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Reconciliation of cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Summary of Significant Accounting Policies        
Cash and cash equivalents $ 24,294 $ 36,507    
Restricted cash 6,000      
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 30,294 $ 36,507 $ 30,015 $ 25,910