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Stock-Based Compensation - Ranges of Outstanding and Exercisable Options (Details) - Options
shares in Thousands
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Options Outstanding  
Vested and expected to vest, Number Outstanding | shares 522
Vested and expected to vest, Weighted Average Remaining Contractual Life (in Years) 7 years 9 months 26 days
Vested and expected to vest, Weighted Average Exercise Price $ 14.34
Exercisable, Number Outstanding | shares 177
Exercisable, Weighted Average Remaining Contractual Life 5 years 4 months 17 days
Exercisable, Weighted Average Exercise Price $ 25.83
$3.80 - $7.19  
Exercise price range  
Lower range limit (in dollars per share) 3.80
Upper range limit (in dollars per share) $ 7.19
Options Outstanding  
Number Outstanding (in shares) | shares 45
Weighted Average Remaining Contractual Life 8 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 5.12
Options Exercisable  
Number Exercisable (in shares) | shares 8
Weighted Average Exercise Price (in dollars per share) $ 5.30
$7.20 - $16.99  
Exercise price range  
Lower range limit (in dollars per share) 7.20
Upper range limit (in dollars per share) $ 16.99
Options Outstanding  
Number Outstanding (in shares) | shares 325
Weighted Average Remaining Contractual Life 9 years 4 months 21 days
Weighted Average Exercise Price (in dollars per share) $ 7.20
Options Exercisable  
Number Exercisable (in shares) | shares 36
Weighted Average Exercise Price (in dollars per share) $ 7.20
$17.00 - $30.99  
Exercise price range  
Lower range limit (in dollars per share) 17.00
Upper range limit (in dollars per share) $ 30.99
Options Outstanding  
Number Outstanding (in shares) | shares 84
Weighted Average Remaining Contractual Life 6 years 3 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 22.39
Options Exercisable  
Number Exercisable (in shares) | shares 66
Weighted Average Exercise Price (in dollars per share) $ 22.92
$31-00 - $54.29  
Exercise price range  
Upper range limit (in dollars per share) $ 54.29
Options Outstanding  
Number Outstanding (in shares) | shares 58
Weighted Average Remaining Contractual Life 2 years 8 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 38.41
Options Exercisable  
Number Exercisable (in shares) | shares 57
Weighted Average Exercise Price (in dollars per share) $ 38.32
$54.30 - $61.09  
Exercise price range  
Lower range limit (in dollars per share) 54.30
Upper range limit (in dollars per share) $ 61.09
Options Outstanding  
Number Outstanding (in shares) | shares 6
Weighted Average Remaining Contractual Life 6 months
Weighted Average Exercise Price (in dollars per share) $ 54.30
Options Exercisable  
Number Exercisable (in shares) | shares 6
Weighted Average Exercise Price (in dollars per share) $ 54.30
$61.10 - $61.10  
Exercise price range  
Lower range limit (in dollars per share) 61.10
Upper range limit (in dollars per share) $ 61.10
Options Outstanding  
Number Outstanding (in shares) | shares 4
Weighted Average Remaining Contractual Life 3 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 61.10
Options Exercisable  
Number Exercisable (in shares) | shares 4
Weighted Average Exercise Price (in dollars per share) $ 61.10
$3.80 - $61.10  
Exercise price range  
Lower range limit (in dollars per share) 3.80
Upper range limit (in dollars per share) $ 61.10
Options Outstanding  
Number Outstanding (in shares) | shares 522
Weighted Average Remaining Contractual Life 7 years 9 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 13.88
Options Exercisable  
Number Exercisable (in shares) | shares 177
Weighted Average Exercise Price (in dollars per share) $ 25.83