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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2013 | Dec. 31, 2015 | Aug. 29, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Number of shares authorized and available for repurchase (in shares) | 540,000 |  |  | 100,000
Treasury stock, shares (in shares) | 81,584 |  | 79,664 |
Value of repurchased common stock | $ 580 |  | $ 572 |
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 |  |
Warrant exercise price (in dollars per share) |  | $ 7.50 |  |
Minimum volume weighted average price per share (in dollars per share) |  | $ 15.00 |  |
Additional shares sold through exercise by underwriter of over-allotment option (in shares) | 0 |  |  |
Total warrants distributed (in shares) |  | 12,981,025 |  |

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