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Stockholders' Equity - Additional Information (Details) $ / shares in Units, shares in Thousands, CAD in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 CAD shares	Sep. 30, 2016 shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 CAD shares	Sep. 30, 2016 shares
Stockholders Equity Note [Line Items]
Shares issuable under Stock Option Plan, as percent of shares outstanding				25.00%	25.00%
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period			324			324
Proceeds from Stock Options Exercised	$ 261	CAD 329		$ 326	CAD 416
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	21	21	285
Derivative [Member]
Stockholders Equity Note [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period				1	1
Non-Derivative [Member]
Stockholders Equity Note [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period				170	170
US Denominated [Member]
Stockholders Equity Note [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period	72	72		122	122
Proceeds from Stock Options Exercised | $	$ 121			$ 153
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance	1,624			1,624
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	1,348			1,348
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	1,348			1,348
Canadian Denominated [Member]
Stockholders Equity Note [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period	135	135		171	171
U.S.dollars [Member]
Stockholders Equity Note [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 1.55			$ 1.55
Class Or Warrant Or Right Outstanding Weighted Average Remaining Contractual Terms				1 year 1 month 24 days	1 year 1 month 24 days
Proceeds from Warrant Exercises | $	$ 31
Stock Issued During Period Shares Stock Warrants Exercised	21	21
Maximum [Member]
Stockholders Equity Note [Line Items]
Shares issuable under Stock Option Plan	3,964			3,964

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