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Stockholders' Equity - Warrants (Details)
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Warrants Outstanding  
Outstanding at the beginning of the period (in shares) | shares 969,549
Exercised (in shares) | shares (638,189)
Canceled/forfeited (in shares) | shares (112,110)
Expired (in shares) | shares (205,000)
Outstanding at the end of the period (in shares) | shares 14,250
Exercisable at period end (in shares) | shares 0
Weighted Average Exercise Price During Period  
Outstanding at the beginning of the period (dollars per share) $ 4.61
Exercised (dollars per share) 4.58
Canceled/forfeited (dollars per share) 5.54
Expired (dollars per share) 4.20
Outstanding at the end of the period (dollars per share) $ 4.30
Exercisable at period end (dollars per share) $ 0.00