Stock-based Compensation - Outstanding Options Under the Protiva Option Plan (Details) - Protiva Share Options	12 Months Ended
	Dec. 31, 2018 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2017 $ / shares shares
Number of optioned common shares
Balance - Number of optioned common shares (in shares)	40,000	40,000	46,000	46,000
Options exercised (in shares)	(40,000)	(40,000)	(6,000)	(6,000)
Options forfeited, canceled or expired (in shares)	0	0	0	0
Balance - Number of optioned common shares (in shares)	0	0	40,000	40,000
Weighted average exercise price
Balance - Weighted average exercise price (in CAD and USD per share) | (per share)	$ 0.30	$ 0.24	$ 0.30	$ 0.22
Options exercised - Weighted average exercise price (in CAD and USD per share) | (per share)	0.30	0.24	0.30	0.23
Options forfeited, canceled or expired - Weighted average exercise price (in CAD and USD per share) | $ / shares	0.00		0.00
Balance - Weighted average exercise price (in CAD and USD per share) | (per share)	$ 0.00	$ 0.00	$ 0.30	$ 0.24
Equivalent number of Company common shares
Number of optioned common shares
Balance - Number of optioned common shares (in shares)	27,007	27,007	31,058	31,058
Options exercised (in shares)	(27,007)	(27,007)	(4,051)	(4,051)
Options forfeited, canceled or expired (in shares)	0	0	0	0
Balance - Number of optioned common shares (in shares)	0	0	27,007	27,007