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Stockholders' Equity (Details 2)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding (shares) | shares 5,862,364
Weighted-Average Remaining Contractual Life (in Years) 5 years 11 months 1 day
Weighted Average Exercise Price ($ per share) $ 6.46
Options Exercisable (shares) | shares 4,236,633
Weighted-Average Exercise Price ($ per share) $ 5.7
$0.00-$3.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 0
Exercise price, upper range limit $ 3
Options Outstanding (shares) | shares 1,269,241
Weighted-Average Remaining Contractual Life (in Years) 6 years 5 months 27 days
Weighted Average Exercise Price ($ per share) $ 2.24
Options Exercisable (shares) | shares 1,111,045
Weighted-Average Exercise Price ($ per share) $ 2.3
$3.01-$6.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 3.01
Exercise price, upper range limit $ 6
Options Outstanding (shares) | shares 1,525,015
Weighted-Average Remaining Contractual Life (in Years) 2 years 4 months 9 days
Weighted Average Exercise Price ($ per share) $ 4.84
Options Exercisable (shares) | shares 1,521,109
Weighted-Average Exercise Price ($ per share) $ 4.8
$6.01-$9.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 6.01
Exercise price, upper range limit $ 9
Options Outstanding (shares) | shares 2,080,183
Weighted-Average Remaining Contractual Life (in Years) 7 years 5 months 4 days
Weighted Average Exercise Price ($ per share) $ 7.38
Options Exercisable (shares) | shares 1,021,290
Weighted-Average Exercise Price ($ per share) $ 7.1
$9.01-$12.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 9.01
Exercise price, upper range limit $ 12
Options Outstanding (shares) | shares 180,464
Weighted-Average Remaining Contractual Life (in Years) 5 years 5 months 23 days
Weighted Average Exercise Price ($ per share) $ 10.31
Options Exercisable (shares) | shares 127,599
Weighted-Average Exercise Price ($ per share) $ 10.3
$12.01-$15.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, lower range limit 12.01
Exercise price, upper range limit $ 15
Options Outstanding (shares) | shares 807,461
Weighted-Average Remaining Contractual Life (in Years) 7 years 4 months 6 days
Weighted Average Exercise Price ($ per share) $ 12.93
Options Exercisable (shares) | shares 455,590
Weighted-Average Exercise Price ($ per share) $ 12.9