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Stock-based Compensation - Director Compensation Program (Details) - RSUs - Non-employee director | 1 Months Ended |
--- | --- | ---
Oct. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 Installment
Stock-based compensation |  |  |
One time grant of shares, value | $ 125,000 | $ 250,000 |
Pro rata shares grant, value | 225,000 | 250,000 |
Number of annual installments | Installment |  |  | 2
Annual grant of shares, value | $ 225,000 | $ 250,000 |

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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 No definition available. + Details
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- Definition The value of shares granted annually to independent directors upon re-election the to Board. + References No definition available. + Details
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