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Preferred and Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 09, 2009 | Nov. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | May 31, 2015
Class of Stock [Line Items] |  |  |  |  |
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares) | 225,904 |  |  |  | 226,819
Exercise price of the Warrants (in dollars per share) | $ 16.60 |  |  |  | $ 16.53
Term of warrants (years) | 10 years |  |  |  |
Repurchase of warrants |  | $ 1,750 |  |  |
Proceeds from sale of common stock |  |  | $ 310 | $ 329 |
Capital Purchase Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from sale of common stock |  |  | $ 310 | $ 329 |
Series A Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of CPP Shares | $ 25,000 |  |  |  |

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