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Stock-based Compensation - Director Compensation Program (Details) - RSUs - Non-employee director	1 Months Ended
	Oct. 31, 2017 USD ($)	Dec. 31, 2016 Installment
Stock-based compensation
One time grant of shares, value	$ 125,000
Pro rata shares grant, value	225,000
Number of annual installments | Installment		2
Annual grant of shares, value	$ 225,000

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- Definition

The additional value of shares granted to newly appointed non-employee director on the date that such individual joins the Board.

+ References

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The value of shares granted annually to independent directors upon re-election the to Board.

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The value of shares granted to newly appointed non-employee director on the date that such individual joins the Board.

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The number of annual installments that RSUs granted to newly appointed independent directors will vest.

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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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