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Stock-Based Compensation Arrangements (Stock Option and Restricted Stock Grants) (Detail) - $ / shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Shares    
Outstanding, beginning of period 21,657,776 4,523,900
Stock options granted 1,185,400 17,779,027
Stock options exercised 0 0
Restricted stock exercised 0 0
Cancelled/Expired (780,406) (14,060)
Outstanding, end of period 22,062,770 22,288,867
Exercisable, end of period 8,211,111 2,609,643
Weighted Avg. Exercise Price    
Outstanding, beginning of period $ 0.21 $ 0.39
Stock options granted 0.05 0.17
Stock options exercised 0.00 0.00
Restricted stock exercised 0.00 0.00
Cancelled/Expired 0.33 0.28
Outstanding, end of period 0.2 0.28
Exercisable, end of period $ 0.25 $ 0.36