XML 92 R79.htm IDEA: XBRL DOCUMENT v3.10.0.1
Revenue recognition - Recognized revenue in the period (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from Contract with Customer [Abstract]                      
Amounts included in contract liabilities at the beginning of the period                 $ 0    
Performance obligations satisfied in previous period                 0    
Revenue from Contract with Customer, Including Assessed Tax $ 85,833 $ 53,021 $ 68,170 $ 55,981 $ 57,953 $ 41,780 $ 47,891 $ 26,442 264,734 $ 194,392 $ 82,705
Total product revenue                 $ 263,005