Common Shares - Summary Of Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Shares
Number of options, beginning of period (in shares)	1,437,000	1,319,149
Granted, Number of options (in shares)	0	350,000
Number of options, Exercised (in shares)		(163,667)
Number of options, Cancelled/Forfeited (in shares)	(70,000)	(16,667)
Number of options, Expired (in shares)		(51,815)
Number of options, end of period (in shares)	1,367,000	1,437,000	1,319,149
Number of options, Exercisable (in shares)	1,103,001
Weighted average exercise price per option, beginning of period (in dollars per share)	$ 0.73	$ 0.71
Weighted average exercise price per option, Granted (in dollars per share)		0.73
Weighted average exercise price per option, Exercised (in dollars per share)		0.54
Weighted average exercise price per option, Cancelled/Forfeited (in dollars per share)	1.02	0.75
Weighted average exercise price per option, Expired (in dollars per share)		0.70
Weighted average exercise price per option, end of period (in dollars per share)	0.72	$ 0.73	$ 0.71
Weighted average exercise price, Exercisable (in dollars per share)	$ 0.72
Weighted average remaining contractual term, Outstanding	3 years 3 months 22 days	3 years 5 months 27 days	3 years 10 months 2 days
Weighted average remaining contractual term, Exercisable	3 years 2 months 5 days
Aggregate intrinsic value, Outstanding, beginning of period (in dollars)	$ 35	$ 1
Aggregate intrinsic value, Exercised (in dollars)		33
Aggregate intrinsic value, Expired (in dollars)		2
Aggregate intrinsic value, Outstanding, end of period (in dollars)		$ 35	$ 1