Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

v3.8.0.1
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets        
Cash and cash equivalents     $ 30,113  
Restricted cash     576  
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 17,497 $ 22,793 $ 30,689 $ 26,582