Quarterly report pursuant to Section 13 or 15(d)

Entity Level Information - Composition of Revenues (Details)

v3.19.2
Entity Level Information - Composition of Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Entity Wide Information Revenue From External Customer [Line Items]        
Total revenues $ 43,747 $ 31,450 $ 70,231 $ 49,640
Product Sales        
Entity Wide Information Revenue From External Customer [Line Items]        
Total revenues 43,609 31,017 69,941 47,984
Services        
Entity Wide Information Revenue From External Customer [Line Items]        
Total revenues $ 138 $ 433 $ 290 $ 1,656