Compensation and Other Benefit Plans - Stock Option Activity (Details) - Stock Options [Member] - $ / shares |
12 Months Ended | |
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Dec. 31, 2017 |
Dec. 31, 2016 |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | ||
| Number of shares, Outstanding at beginning of year | 568,292 | |
| Number of shares, Granted | 1,387,820 | |
| Number of shares, Exercised | (110,400) | 0 |
| Number of shares, Forfeited, expired or cancelled | (223,647) | |
| Number of shares, Outstanding at end of year | 1,622,065 | 568,292 |
| Number of shares, Exercisable at end of year | 849,279 | |
| Weighted Average Exercise Price Per Share, Outstanding at beginning of year | $ 77.70 | |
| Weighted Average Exercise Price Per Share, Granted | 10.94 | |
| Weighted Average Exercise Price Per Share, Exercised | 5.95 | |
| Weighted Average Exercise Price Per Share, Forfeited, expired or cancelled | 84.40 | |
| Weighted Average Exercise Price Per Share, Outstanding at end of year | 24.54 | $ 77.70 |
| Weighted Average Exercise Price Per Share, Exercisable at end of year | $ 32.79 | |
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- Definition 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. No definition available.
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average price of options that were either forfeited or expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Gross number of share options (or share units) granted during the period. No definition available.
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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