XML 76 R70.htm IDEA: XBRL DOCUMENT v3.19.3
Revenue recognition - Recognized revenue in the period (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]        
Amounts included in contract liabilities at the beginning of the period $ 2,269 $ 0 $ 2,269 $ 0
Performance obligations satisfied in current period 69,100 53,021 207,630 177,172
Total product revenue $ 71,369 $ 53,021 $ 209,899 $ 177,172