Quarterly report pursuant to Section 13 or 15(d)

Public Offering of Common Stock (Details)

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Public Offering of Common Stock (Details) - USD ($)
Aug. 26, 2015
Feb. 13, 2015
Feb. 05, 2015
Sep. 30, 2016
Dec. 31, 2015
Shares of common stock sold       30,209,036 29,984,591
Par value of common stock       $ 0.01 $ 0.01
February 2015 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    
February 2015 Offering inclusive of over-allotment option          
Shares of common stock sold   5,437,200      
Public offering price (in dollars per share)   $ 2.75      
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        
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 $ 17,500,000