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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation STOCK-BASED COMPENSATION
In June 2018, we adopted the 2018 Long-Term Incentive Plan, which provided for the issuance of restricted stock awards and units, incentive and nonqualified stock options, performance unit awards, stock appreciation rights, and other stock-based awards to employees, consultants and members of our Board of Directors.
We report our stock-based compensation expense (inclusive of our incentive stock plan, employee stock purchase plan, and 401(k) contribution matching program) in the accompanying Condensed Consolidated Statements of Operations within “total operating costs and expenses” for the three and nine months ended September 30, 2020 and 2019, as follows:

 Three Months Ended
September 30,		Nine Months Ended
September 30,
 2020201920202019
Selling, general and administrative$3,018 $3,156 $9,773 $10,550 
Research and development1,090 1,030 3,598 3,251 
Total stock-based compensation$4,108 $4,186 $13,371 $13,801