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Stock options, restricted stock and performance stock options (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jul. 27, 2015
Dec. 31, 2014
Nov. 30, 2009
Employee stock options | Performance based          
Stock options, restricted stock and performance stock options          
Vesting period   3 years      
Stock options          
Stock options, restricted stock and performance stock options          
Expiration period   10 years      
Expiration period of unexercised vested award after termination of employment   90 days      
Weighted average key assumptions used in determining the fair value of options granted          
Expected dividend yield (as a percent) 0.00% 0.00%      
Expected stock price volatility (as a percent) 60.00% 60.00%      
Expected life 5 years 5 years      
Weighted-average option fair value at grant (in dollars per share) $ 5.568 $ 5.235      
Stock options | Weighted average          
Weighted average key assumptions used in determining the fair value of options granted          
Risk-free interest rate (as a percent) 1.70% 1.67%      
Neos Therapeutics, Inc. 2009 Equity Plan          
Stock options, restricted stock and performance stock options          
Shares reserved for issuance under the plan 1,375,037 1,375,037     688,059
Remaining shares available for grant 7,717 7,717   277,298  
Subsequent event | Neos Therapeutics, Inc. 2015 Stock Option and Incentive Plan          
Stock options, restricted stock and performance stock options          
Shares reserved for issuance under the plan     767,330