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Additional Paid-In Capital (Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Unvested, Number of units (in shares) 3,692,829 3,692,829
Unvested, Weighted average fair value (in dollars per share) $ 0.74 $ 0.74
Estimated forfeiture rate (as a percent) 29.00%  
Minimum [Member]    
Vesting period 1 year