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Stockholders' Equity - Additional Information (Details) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 06, 2018 | Aug. 06, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 29, 2011
Stockholders Equity Note [Abstract] |  |  |  |  |
Number of shares authorized and available for repurchase (in shares) |  |  | 540,000 |  | 100,000
Treasury stock, shares (in shares) |  |  | 81,584 |  |
Value of repurchased common stock |  |  | $ 580,000 | $ 580,000 |
Total warrants distributed (in shares) |  | 12,981,025 |  |  |
Dividend declaration date |  |  | Aug. 06, 2013 |  |
Dividend date of record |  |  | Jul. 29, 2013 |  |
Number of warrants received for each share of common stock (in shares) |  |  | 5 |  |
Number of warrants that entitle holder to purchase one share of common stock (in shares) |  |  | 25 |  |
Number of common shares callable by warrants (in shares) |  |  | 1 |  |
Warrant exercise price (in dollars per share) |  |  | $ 7.50 |  |
Gross proceeds from warrant exercises | $ 926,948 |  | $ 927,000 |  |
Issuance of shares on exercise of warrants | 123,593 |  |  |  |

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