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Stock-Based Compensation - Summary of Significant Ranges of Outstanding and Exercisable Options (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Aug. 23, 2016
Options Exercisable    
Weighted Average Exercise Price (in dollars per share)   $ 7.20
Options    
Options Outstanding    
Vested and expected to vest, Number Outstanding 303  
Exercisable, Number Outstanding 178  
Vested and expected to vest, Weighted Average Remaining Contractual Life (in Years) 5 years 10 months 6 days  
Exercisable, Weighted Average Remaining Contractual Life 6 years 1 month 9 days  
Vested and expected to vest, Weighted Average Exercise Price $ 4.52  
Exercisable, Weighted Average Exercise Price 6.25  
Options | $0.75 - $1.27    
Exercise price range    
Lower range limit (in dollars per share) 0.75  
Upper range limit (in dollars per share) $ 1.27  
Options Outstanding    
Number Outstanding (in shares) 159  
Weighted Average Remaining Contractual Life 4 years 9 months 18 days  
Weighted Average Exercise Price (in dollars per share) $ 0.75  
Options Exercisable    
Number Exercisable (in shares) | shares 53  
Weighted Average Exercise Price (in dollars per share) $ 0.75  
Options | $1.28 - $7.19    
Exercise price range    
Lower range limit (in dollars per share) 1.28  
Upper range limit (in dollars per share) $ 7.19  
Options Outstanding    
Number Outstanding (in shares) 51  
Weighted Average Remaining Contractual Life 5 years 4 months 24 days  
Weighted Average Exercise Price (in dollars per share) $ 2.09  
Options Exercisable    
Number Exercisable (in shares) | shares 22  
Weighted Average Exercise Price (in dollars per share) $ 2.85  
Options | $7.20 - $20.49    
Exercise price range    
Lower range limit (in dollars per share) 7.20  
Upper range limit (in dollars per share) $ 20.49  
Options Outstanding    
Number Outstanding (in shares) 108  
Weighted Average Remaining Contractual Life 7 years 3 months 14 days  
Weighted Average Exercise Price (in dollars per share) $ 7.20  
Options Exercisable    
Number Exercisable (in shares) | shares 84  
Weighted Average Exercise Price (in dollars per share) $ 7.20  
Options | $20.50 - $46.20    
Exercise price range    
Lower range limit (in dollars per share) 20.50  
Upper range limit (in dollars per share) $ 46.20  
Options Outstanding    
Number Outstanding (in shares) 19  
Weighted Average Remaining Contractual Life 6 years 2 months 8 days  
Weighted Average Exercise Price (in dollars per share) $ 21.53  
Options Exercisable    
Number Exercisable (in shares) | shares 19  
Weighted Average Exercise Price (in dollars per share) $ 21.55  
Options | $0.75 - $46.20    
Exercise price range    
Lower range limit (in dollars per share) 0.75  
Upper range limit (in dollars per share) $ 46.20  
Options Outstanding    
Number Outstanding (in shares) 337  
Weighted Average Remaining Contractual Life 5 years 9 months 7 days  
Weighted Average Exercise Price (in dollars per share) $ 4.19  
Options Exercisable    
Number Exercisable (in shares) | shares 178  
Weighted Average Exercise Price (in dollars per share) $ 6.25