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Share-based Compensation - Plan Information (Details) - shares
6 Months Ended 12 Months Ended
Jan. 01, 2019
Jun. 27, 2018
Jan. 01, 2018
Oct. 16, 2017
Oct. 17, 2016
Oct. 16, 2015
Jun. 30, 2019
Dec. 31, 2018
Jan. 01, 2016
Jul. 31, 2015
Nov. 30, 2009
Stock options outstanding | Performance based                      
Stock options, restricted stock and performance stock options                      
Vesting period             3 years        
Stock options | Minimum                      
Stock options, restricted stock and performance stock options                      
Vesting period             2 years        
Stock options | Maximum                      
Stock options, restricted stock and performance stock options                      
Vesting period             4 years        
Restricted stock                      
Stock options, restricted stock and performance stock options                      
Shares surrendered by holder to cover taxes associated with vesting       14,895 9,709 9,197          
Neos Therapeutics, Inc. 2009 Equity Plan                      
Stock options, restricted stock and performance stock options                      
Shares reserved for issuance under the plan                     1,375,037
Neos Therapeutics, Inc. 2009 Equity Plan | 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        
Neos Therapeutics, Inc. 2009 Equity Plan | Restricted stock | Minimum                      
Stock options, restricted stock and performance stock options                      
Vesting period             1 month        
Neos Therapeutics, Inc. 2009 Equity Plan | Restricted stock | Maximum                      
Stock options, restricted stock and performance stock options                      
Vesting period             48 months        
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  
Increase to the number of shares reserved and available for issuance as a percentage of outstanding common stock (as a percent)                 5.00%    
Increase in number of shares reserved and available for issuance 2,483,815   1,449,847                
Stock option exercise price, minimum expressed as percentage of fair market value on grant date             100.00%        
Shares related to forfeited prior plan options transferred into shares available under current plan             350,396 82,635      
Shares available for grant             3,161,056        
Neos Therapeutics, Inc. 2015 Stock Option and Incentive Plan | 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        
Neos Therapeutics, Inc 2018 Inducement Plan                      
Stock options, restricted stock and performance stock options                      
Shares reserved for issuance under the plan             800,000        
Stock option exercise price, minimum expressed as percentage of fair market value on grant date             100.00%        
Shares available for grant             0        
Neos Therapeutics, Inc 2018 Inducement Plan | Stock options                      
Stock options, restricted stock and performance stock options                      
Expiration period             10 years        
Neos Therapeutics, Inc 2018 Inducement Plan | Stock options | Chief Executive Officer                      
Stock options, restricted stock and performance stock options                      
Vested shares of the common stock subject to the option vests in equal installments over four years (in shares)   600,000