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Additional Paid-In Capital (Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Unvested, Number of units (in shares) | shares 3,692,829
Cancelled, Number of units (in shares) | shares (725,013)
Vested, Number of units (in shares) | shares (493,345)
Granted, Number of units (in shares) | shares 1,727,000
Unvested, Number of units (in shares) | shares 4,201,471
Unvested, weighted average fair value (in dollars per share) $ 0.74
Cancelled, Weighted average fair value (in dollars per share) 0.80
Vested, Weighted average fair value (in dollars per share) 1.62
Granted, Weighted average fair value (in dollars per share) 0.27
Unvested, weighted average fair value (in dollars per share) $ 0.43
Minimum [Member]  
Vesting period 1 year