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Public Offering of Common Stock (Details) - USD ($) | Aug. 26, 2015 | Feb. 13, 2015 | Feb. 05, 2015 | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | ---
Shares of common stock sold |  |  |  | 29,844,503 | 19,488,814
Par value of common stock |  |  |  | $ 0.01 | $ 0.01
Offering |  |  |  |  |
Shares of common stock sold |  |  | 4,728,000 |  |
Public offering price (in dollars per share) |  |  | $ 2.75 |  |
Underwriting Agreement |  |  |  |  |
Shares of common stock sold |  |  | 709,200 |  |
Number of days to underwriter to sell additional common shares |  |  | 30 days |  |
Offering inclusive of over-allotment option |  |  |  |  |
Shares of common stock sold |  | 5,437,200 |  |  |
Gross proceeds from issuance of common stock |  | $ 15,000,000 |  |  |
Underwriting discounts, commissions and other estimated offering expenses |  | $ 1,400,000 |  |  |
Securities Purchase Agreement |  |  |  |  |
Offering expenses | $ 300,000 |  |  |  |
Offering expenses paid | $ 181,000 |  |  |  |
ESSEX | Securities Purchase Agreement |  |  |  |  |
Shares of common stock sold | 4,861,111 |  |  |  |
Public offering price (in dollars per share) | $ 3.60 |  |  |  |
Gross proceeds from issuance of common stock | $ 17,200,000 |  |  |  |

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