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Stockholders' Equity - Compensation Cost Related to Nonvested Awards (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 181,908 | 126,849
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 627,700 | $ 698,100
Restricted Stock [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
weighted average estimated fair value of restricted stock | $ 3.45 | $ 5.50

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