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Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2016

Shareholders' equity

Schedule of issued shares to BMS upon extinguishment of derivative obligations

		Ordinary shares
		Ordinary shares						Additional paid-in capital			Total shareholders' equity
		No. of shares			Amount			Additional paid-in capital			Total shareholders' equity
		in thousands, except share and per share amounts
Issuance of shares at $33.84 per share on June 12, 2015			1,112,319		$	61		$	37,579		$	37,640
Extinguishment of derivative upon issuance of shares on June 12, 2015			—			—			(4,972	)		(4,972	)
Issuance of shares at $29.67 per share on August 7, 2015			1,275,789			71			37,782			37,853
Extinguishment of derivative upon issuance of shares on August 7, 2015			—			—			1,410			1,410

Balance at December 31, 2015			2,388,108		$	132		$	71,799		$	71,931