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Stockholders' Equity - Summary of Stock Option Activity Under Stock Option and Incentive Plans (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 24, 2015
Oct. 21, 2015
Jan. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Stockholders Equity - Summary Of Stock Option Activity Under Stock Option And Incentive Plans Details          
Outstanding, Beginning balance     4,928,291 4,928,291 4,073,898
Granted       53,550 1,172,197
Exercised      
Lapsed/terminated       (557,282) (317,804)
Outstanding, Ending balance       4,424,559 4,928,291
Exercisable       3,628,495 2,806,696
Expected to vest at December 31       346,064 1,660,169
Outstanding Beginning balance, Weighted Average Exercise Price     $ 2.92 $ 2.92 $ 3.25
Granted, Weighted Average Exercise Price $ 0.22 $ 0.22 $ 0.60 $ 0.60 $ 1.96
Exercised, Weighted Average Exercise Price      
Lapsed/terminated, Weighted Average Exercise Price       $ 2.95 $ 3.56
Outstanding, Ending balance, Weighted Average Exercise Price       2.89 2.92
Exercisable Weighted Average Exercise Price       2.77 2.94
Expected to vest at December 31, Weighted Average Exercise Price       $ 2.00 $ 2.46
Oustanding, Weighted Average Life Remaining       4 years 4 years
Exercisable, Weighted Average Life Remaining       4 years 7 months 6 days 5 years
Expected to vest, Weighted Average Life Remaining       3 years 2 months 12 days 5 years 9 months 18 days
Aggregate intrinsic value of outstanding options at December 31      
Aggregate intrinsic value of exercisable options at December 31      
Aggregate intrinsic value of options expected to vest at December 31