Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Breakdown of the Company Revenue (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Breakdown of the Company Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Concentration Risk [Line Items]                      
Revenues $ 63,787 $ 69,030 $ 64,121 $ 52,500 $ 50,851 $ 54,422 $ 54,567 $ 42,989 $ 249,438 $ 202,829 $ 159,005
U.S. revenue                      
Concentration Risk [Line Items]                      
Revenues                 193,919 152,723 123,660
Non-U.S. revenue                      
Concentration Risk [Line Items]                      
Revenues                 $ 55,519 $ 50,106 $ 35,345