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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-based compensation, Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units [Abstract]
Stock-based compensation expense	$ 19	$ 52	$ 203	$ 73	$ 570	$ 136	$ 904	$ 186
Unrecognized compensation expense							$ 2,520
Weighted average period of recognition							1 year 3 months
Restricted Stock Units [Member] \| New Members of the Board of Directors [Member]
Restricted Stock Units [Abstract]
Granted (in shares)							140,097
Weighted average grant date fair value (in dollars per share)							$ 2.07
Expiry period							10 years
Aggregate grant date fair value							$ 290