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Stockholders' Equity - Options Outstanding and Exercisable (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 602,207
Weighted Average Remaining Contractual Life (in years) 8 years 1 month 13 days
Weighted Average Exercise Price (in dollars per share) $ 8.58
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 304,610
Weighted Average Remaining Contractual Life (in years) 7 years 1 month 17 days
Weighted Average Exercise Price (in dollars per share) $ 9.38
Exercise price, range one  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 2.30
Range of Exercise Prices, upper limit (in dollars per share) $ 4.00
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 61,218
Weighted Average Remaining Contractual Life (in years) 7 years 3 months 7 days
Weighted Average Exercise Price (in dollars per share) $ 2.33
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 60,586
Weighted Average Remaining Contractual Life (in years) 7 years 3 months 7 days
Weighted Average Exercise Price (in dollars per share) $ 2.33
Exercise price, range two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 4.01
Range of Exercise Prices, upper limit (in dollars per share) $ 4.45
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 132,778
Weighted Average Remaining Contractual Life (in years) 8 years 26 days
Weighted Average Exercise Price (in dollars per share) $ 4.10
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 114,187
Weighted Average Remaining Contractual Life (in years) 8 years 26 days
Weighted Average Exercise Price (in dollars per share) $ 4.10
Exercise price, range three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 4.46
Range of Exercise Prices, upper limit (in dollars per share) $ 5.48
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 198,200
Weighted Average Remaining Contractual Life (in years) 9 years 1 month 13 days
Weighted Average Exercise Price (in dollars per share) $ 5.42
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 25,700
Weighted Average Remaining Contractual Life (in years) 8 years 6 months 15 days
Weighted Average Exercise Price (in dollars per share) $ 5.07
Exercise price, range four  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 5.49
Range of Exercise Prices, upper limit (in dollars per share) $ 13.58
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 108,011
Weighted Average Remaining Contractual Life (in years) 7 years 6 months 15 days
Weighted Average Exercise Price (in dollars per share) $ 8.36
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 62,137
Weighted Average Remaining Contractual Life (in years) 6 years 9 months 22 days
Weighted Average Exercise Price (in dollars per share) $ 8.46
Exercise price, range five  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit (in dollars per share) 13.59
Range of Exercise Prices, upper limit (in dollars per share) $ 71.90
OPTIONS OUTSTANDING  
Number of Shares Outstanding (in shares) | shares 102,000
Weighted Average Remaining Contractual Life (in years) 7 years 4 months 10 days
Weighted Average Exercise Price (in dollars per share) $ 24.56
OPTIONS EXERCISABLE  
Number of Shares Exercisable (in shares) | shares 42,000
Weighted Average Remaining Contractual Life (in years) 3 years 11 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 37.89