Share Capital - Non-Voting Shares (Details) - shares		1 Months Ended	3 Months Ended
	May 14, 2018	Mar. 31, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Ordinary shares, issued (shares)				21,511,505	21,459,997
Ordinary shares, outstanding (shares)				21,511,505	21,459,997
Series C non-voting convertible ordinary shares
Class of Stock [Line Items]
Stock issued upon exercise of Warrants (shares)		66,520
Conversion ratio, issued upon conversion (shares)		1	1
Aggregate voting power of Company's issued share capital (percent) (not to exceed)		0.01%	0.01%
Stock issued upon conversion (shares)			192,485
Ordinary shares, issued (shares)				2,599,672	2,599,672
Ordinary shares, outstanding (shares)				2,599,672	2,599,672
Common Class B
Class of Stock [Line Items]
Ordinary shares, issued (shares)				0
Ordinary shares, outstanding (shares)				0
Common Class D
Class of Stock [Line Items]
Ordinary shares, issued (shares)				0
Ordinary shares, outstanding (shares)				0
Common Class E
Class of Stock [Line Items]
Ordinary shares, issued (shares)				910,010	910,010
Ordinary shares, outstanding (shares)				910,010	910,010
KaylaRe
Class of Stock [Line Items]
Number of Enstar Ordinary shares issued (in shares)	2,007,017
Common Class E | KaylaRe
Class of Stock [Line Items]
Number of Enstar Ordinary shares issued (in shares)	505,239