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Stock-Based Compensation - Ranges of Outstanding and Exercisable Options (Details) - Options - $ / shares
shares in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Options Outstanding    
Vested and expected to vest, Number Outstanding 240 522
Vested and expected to vest, Weighted Average Remaining Contractual Life (in Years) 6 years 3 months 26 days 7 years 9 months 26 days
Vested and expected to vest, Weighted Average Exercise Price $ 16.77 $ 14.34
Exercisable, Number Outstanding 162 177
Exercisable, Weighted Average Remaining Contractual Life 5 years 1 month 10 days 5 years 4 months 17 days
Exercisable, Weighted Average Exercise Price $ 21.34 $ 25.83
$3.80 - $7.19    
Exercise price range    
Lower range limit (in dollars per share) 2.36 3.80
Upper range limit (in dollars per share) $ 7.19 $ 7.19
Options Outstanding    
Number Outstanding (in shares) 19 45
Weighted Average Remaining Contractual Life 6 years 5 months 9 days 8 years 8 months 5 days
Weighted Average Exercise Price (in dollars per share) $ 5.07 $ 5.12
Options Exercisable    
Number Exercisable (in shares) 12 8
Weighted Average Exercise Price (in dollars per share) $ 5.30 $ 5.30
$7.20 - $16.99    
Exercise price range    
Lower range limit (in dollars per share) 7.20 7.20
Upper range limit (in dollars per share) $ 16.99 $ 16.99
Options Outstanding    
Number Outstanding (in shares) 122 325
Weighted Average Remaining Contractual Life 8 years 4 months 6 days 9 years 4 months 21 days
Weighted Average Exercise Price (in dollars per share) $ 7.20 $ 7.20
Options Exercisable    
Number Exercisable (in shares) 49 36
Weighted Average Exercise Price (in dollars per share) $ 7.20 $ 7.20
$17.00 - $30.99    
Exercise price range    
Lower range limit (in dollars per share) 17.00 17.00
Upper range limit (in dollars per share) $ 20.49 $ 30.99
Options Outstanding    
Number Outstanding (in shares) 4 84
Weighted Average Remaining Contractual Life 3 years 9 months 15 days 6 years 3 months 29 days
Weighted Average Exercise Price (in dollars per share) $ 17.00 $ 22.39
Options Exercisable    
Number Exercisable (in shares) 4 66
Weighted Average Exercise Price (in dollars per share) $ 17.00 $ 22.92
$31-00 - $54.29    
Exercise price range    
Lower range limit (in dollars per share) 20.50  
Upper range limit (in dollars per share) $ 30.89 $ 54.29
Options Outstanding    
Number Outstanding (in shares) 45 58
Weighted Average Remaining Contractual Life 7 years 5 months 1 day 2 years 8 months 19 days
Weighted Average Exercise Price (in dollars per share) $ 20.50 $ 38.41
Options Exercisable    
Number Exercisable (in shares) 39 57
Weighted Average Exercise Price (in dollars per share) $ 20.50 $ 38.32
$54.30 - $61.09    
Exercise price range    
Lower range limit (in dollars per share) 30.90 54.30
Upper range limit (in dollars per share) $ 41.89 $ 61.09
Options Outstanding    
Number Outstanding (in shares) 41 6
Weighted Average Remaining Contractual Life 7 months 10 days 6 months
Weighted Average Exercise Price (in dollars per share) $ 36.44 $ 54.30
Options Exercisable    
Number Exercisable (in shares) 41 6
Weighted Average Exercise Price (in dollars per share) $ 33.41 $ 54.30
$61.10 - $61.10    
Exercise price range    
Lower range limit (in dollars per share) 41.90 61.10
Upper range limit (in dollars per share) $ 46.20 $ 61.10
Options Outstanding    
Number Outstanding (in shares) 17 4
Weighted Average Remaining Contractual Life 4 years 1 month 28 days 3 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 44.01 $ 61.10
Options Exercisable    
Number Exercisable (in shares) 17 4
Weighted Average Exercise Price (in dollars per share) $ 44.01 $ 61.10
$3.80 - $61.10    
Exercise price range    
Lower range limit (in dollars per share) 2.36 3.80
Upper range limit (in dollars per share) $ 46.20 $ 61.10
Options Outstanding    
Number Outstanding (in shares) 248 522
Weighted Average Remaining Contractual Life 6 years 4 months 24 days 7 years 9 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 16.47 $ 13.88
Options Exercisable    
Number Exercisable (in shares) 162 177
Weighted Average Exercise Price (in dollars per share) $ 21.34 $ 25.83