| Stockholders' Equity (Details) | 3 Months Ended | 
|---|---|
| Mar. 31, 2019  $ / shares  shares | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | |
| Balance at beginning | shares | 1,386,396 | 
| Granted | shares | |
| Expired / forfeited | shares | (12) | 
| Balance at ending | shares | 1,386,384 | 
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] | |
| Balance at beginning | $ / shares | $ 11.09 | 
| Granted | $ / shares | |
| Expired / forfeited | $ / shares | 385.60 | 
| Balance at ending | $ / shares | $ 11.09 | 
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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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://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available. 
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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://fasb.org/us-gaap/role/ref/legacyRef 
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- References No definition available. 
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. 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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