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Stockholders' Equity - Restricted Stock Units (Details)
 9 Months Ended
Sep. 30, 2015
$ / shares
shares
Restricted Stock Units  
Outstanding at beginning of period (in options) | shares 459,271
Granted (in options) | shares 326,000
Canceled/forfeited (in options) | shares (105,565)
Outstanding at end of period (in options) | shares 628,445
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) $ 8.95
Granted (in dollars per share) 8.35
Canceled/forfeited (in dollars per share) 6.26
Outstanding at end of period (in dollars per share) $ 8.58
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 8 years 4 months 24 days
Restricted Stock Units (RSUs) [Member]  
Restricted Stock Units  
Outstanding at beginning of period (in options) | shares 0
Granted (in options) | shares 72,750
Canceled/forfeited (in options) | shares (14,250)
Outstanding at end of period (in options) | shares 58,500
Weighted Average Grant Date Fair Value  
Outstanding at beginning of period (in dollars per share) $ 0.00
Granted (in dollars per share) 6.82
Canceled/forfeited (in dollars per share) 5.55
Outstanding at end of period (in dollars per share) $ 7.13
Weighted Average Remaining Contractual Life (in years)  
Outstanding at end of period 1 year 1 month 6 days