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Commitments and Contigencies - Preferred Stock Dividends (Details) - Series A Convertible Preferred Stock. - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Mar. 31, 2015
Convertible Series A Preferred Stock |  |  |
Dividend rate | 8.00% |  |
Original issue price, per share |  |  | $ 6.70585
Cumulative unpaid dividends | $ 0.5 | $ 0.3 |

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- Definition Aggregate amount of cumulative preferred dividends in arrears. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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