Business combination - Narrative (Details) - shares |
Mar. 31, 2017 |
Dec. 31, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
---|---|---|---|---|
Ordinary Shares | ||||
Business Acquisition [Line Items] | ||||
Shares outstanding (in shares) | 103,464,186 | 50,481,822 | 50,481,822 | 50,481,822 |