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Stockholders' Equity - Compensation Cost Related to Nonvested Awards (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Restricted Stock [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Number of shares issued | 91,740 | 181,908
Value of shares issued | $ 347,700 | $ 627,700
Weighted average estimated fair value | $ 3.79 | $ 3.45
Restricted Stock Units [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Number of shares issued | 139,497 | 10,260
Value of shares issued | $ 711,900 | $ 55,100
Weighted average estimated fair value | $ 5.10 | $ 5.37

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