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Capital Stock - outstanding and exercisable options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	1,956,732	3,780,244	4,096,818
$2.28-3.29 [member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	204,476
Options Outstanding, Weighted Average Remaining Contractual Term	4 years 8 months 26 days
Options Outstanding, Weighted Average Exercise Price	$ 2.71
Options Outstanding, Intrinsic Value	$ 96
Options Exercisable, Number	160,851
Options Exercisable, Weighted Average Remaining Contractual Term	3 years 10 months 20 days
Options Exercisable, Weighted Average Exercise Price	$ 2.66
Options Exercisable, Intrinsic Value	$ 84
3.30-3.49 [member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	175,200
Options Outstanding, Weighted Average Remaining Contractual Term	8 years 9 months 29 days
Options Outstanding, Weighted Average Exercise Price	$ 3.33
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	58,400
Options Exercisable, Weighted Average Remaining Contractual Term	8 years 9 months 29 days
Options Exercisable, Weighted Average Exercise Price	$ 3.33
Options Exercisable, Intrinsic Value	$ 0
3.50-3.92 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	159,037
Options Outstanding, Weighted Average Remaining Contractual Term	5 years 11 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 3.68
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	114,452
Options Exercisable, Weighted Average Remaining Contractual Term	4 years 4 months 28 days
Options Exercisable, Weighted Average Exercise Price	$ 3.64
Options Exercisable, Intrinsic Value	$ 0
3.93-4.08 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	79,019
Options Outstanding, Weighted Average Remaining Contractual Term	2 years 5 months 1 day
Options Outstanding, Weighted Average Exercise Price	$ 4.04
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	79,019
Options Exercisable, Weighted Average Remaining Contractual Term	2 years 5 months 1 day
Options Exercisable, Weighted Average Exercise Price	$ 4.04
Options Exercisable, Intrinsic Value	$ 0
4.09-4.17 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	402,325
Options Outstanding, Weighted Average Remaining Contractual Term	5 years 4 months 28 days
Options Outstanding, Weighted Average Exercise Price	$ 4.12
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	402,325
Options Exercisable, Weighted Average Remaining Contractual Term	5 years 4 months 28 days
Options Exercisable, Weighted Average Exercise Price	$ 4.12
Options Exercisable, Intrinsic Value	$ 0
4.18-4.26 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	49,000
Options Outstanding, Weighted Average Remaining Contractual Term	5 years 9 months
Options Outstanding, Weighted Average Exercise Price	$ 4.21
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	49,000
Options Exercisable, Weighted Average Remaining Contractual Term	5 years 9 months
Options Exercisable, Weighted Average Exercise Price	$ 4.21
Options Exercisable, Intrinsic Value	$ 0
4.27-4.38 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	350,000
Options Outstanding, Weighted Average Remaining Contractual Term	4 years 10 months 17 days
Options Outstanding, Weighted Average Exercise Price	$ 4.31
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	350,000
Options Exercisable, Weighted Average Remaining Contractual Term	4 years 10 months 17 days
Options Exercisable, Weighted Average Exercise Price	$ 4.31
Options Exercisable, Intrinsic Value	$ 0
4.39-5.39 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	146,550
Options Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months 24 days
Options Outstanding, Weighted Average Exercise Price	$ 4.95
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	121,550
Options Exercisable, Weighted Average Remaining Contractual Term	6 years 1 month 2 days
Options Exercisable, Weighted Average Exercise Price	$ 5.05
Options Exercisable, Intrinsic Value	$ 0
5.40-5.54 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	203,625
Options Outstanding, Weighted Average Remaining Contractual Term	6 years 2 months 4 days
Options Outstanding, Weighted Average Exercise Price	$ 5.51
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	144,375
Options Exercisable, Weighted Average Remaining Contractual Term	6 years 2 months 4 days
Options Exercisable, Weighted Average Exercise Price	$ 5.51
Options Exercisable, Intrinsic Value	$ 0
5.55-5.75 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	187,500
Options Outstanding, Weighted Average Remaining Contractual Term	6 years 9 months 7 days
Options Outstanding, Weighted Average Exercise Price	$ 5.58
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable, Number	125,625
Options Exercisable, Weighted Average Remaining Contractual Term	6 years 5 months 4 days
Options Exercisable, Weighted Average Exercise Price	$ 5.56
Options Exercisable, Intrinsic Value	$ 0
2.28-5.75 [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Options outstanding, shares	1,956,732
Options Outstanding, Weighted Average Remaining Contractual Term	5 years 9 months 14 days
Options Outstanding, Weighted Average Exercise Price	$ 4.25
Options Outstanding, Intrinsic Value	$ 96
Options Exercisable, Number	1,605,597
Options Exercisable, Weighted Average Remaining Contractual Term	5 years 3 months 3 days
Options Exercisable, Weighted Average Exercise Price	$ 4.26
Options Exercisable, Intrinsic Value	$ 84

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