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Common Stock Rights Offering (Details) - USD ($) shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 21, 2017 | Feb. 14, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Shares of common stock sold in rights offering |  |  | 7,053 |  | 6,269
Proceeds from common stock rights offering, gross |  |  | $ 9,349 | $ 0 |
Offering-related expenses |  |  | 145 | $ 0 |
Preferred stock redemption |  |  | $ 10,000 |  | $ 10,000
Series A Preferred Stock [Member] |  |  |  |  |
Preferred stock redemption | $ 10,000 | $ 10,000 |  |  |

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