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Capital Stock - Stock options and restricted stock activity (Details) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Opening Balance Stock Options Outstanding		1,956,732
Stock options, Granted		804,039
Stock option, Exercised	(971,000)	(2,500)	(1,690,000)
Expired		0
Stock options, Cancelled and Forfeited		(616,436)
Closing Balance Stock Options Outstanding		2,141,835
Begining Balance Weighted Average Exercise Price		$ 4.25
Stock Options, Weighted Average Exercise Price, Granted		3.35
Stock Options, Weighted Average Exercise Price, Exercised		3.25
Stock Options, Weighted Average Exercise Price, Cancelled / Forfeited		3.96
Closing Balance Weighted Average Exercise Price		$ 4.15
Begining Balance Restricted Stock Units Outstanding		1,233,762
Restricted stock units, Granted		1,472,884
Retricted Stock Units, Vested		(788,512)
Restricted Stock Units, Cancelled/ Forfeited		(471,006)
Closing Balance Restricted Stock Units Outstanding		1,447,128
Begining Balance Grant Date Fair Value Of Restricted Stock Units		$ 3.36
Restricted Stock Units Grant Date Fair Value, Granted		2.25
Restricted Stock Unit, Grant Date Fair Value, Vested		3.3
Restricted Stock Unit Grant Date Fair Value, Forfeited		3.41
Closing Balance Grant Date Fair Value Of Restricted Stock Units		$ 3.19
Market Condition Restricted Stock Unit [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Begining Balance Restricted Stock Units Outstanding		116,944
Restricted stock units, Granted		541,627
Retricted Stock Units, Vested		(3,778)
Restricted Stock Units, Cancelled/ Forfeited		(188,680)
Closing Balance Restricted Stock Units Outstanding		466,113
Begining Balance Grant Date Fair Value Of Restricted Stock Units		$ 4.19
Restricted Stock Units Grant Date Fair Value, Granted		2.14
Restricted Stock Unit, Grant Date Fair Value, Vested		3.3
Restricted Stock Unit Grant Date Fair Value, Forfeited		3.63
Closing Balance Grant Date Fair Value Of Restricted Stock Units		$ 4.16

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average grant-date fair value of options vested.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Number of share options (or share units) exercised during the current period.

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