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Stockholders' Equity (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Feb. 16, 2017
Stockholders Equity [Line Items] |  |  |
Stock Repurchased During Period, Shares | 1,190,420 |  |
Beneficial Ownership Percentage Limit | 4.90% |  | 60.00%
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding | $ 0 | $ 0 |
Treasury Stock Acquired, Average Cost Per Share | $ 3.89 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 15,366,000 |  |
Stock Repurchase Program Expiration Date | Feb. 28, 2019 |  |
Common Stock [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Stock Repurchased During Period, Shares | (59,800) | (8,669) |
Share Repurchase Program [Domain] |  |  |
Stockholders Equity [Line Items] |  |  |
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized; no shares issued or outstanding | $ 0.001 |  |
Share Price | $ 15.00 |  |

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