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Accrued Expenses and Other Current Liabilities
12 Months Ended
Dec. 31, 2020
Accrued Liabilities and Other Liabilities [Abstract]  
Accrued Expenses and Other Current Liabilities Accrued Expenses and Other Current Liabilities
 
Accrued expenses and other current liabilities as of December 31, 2020 and 2019 consisted of the following:
 
 December 31,
 20202019
Research and development expenses$4,939,095 $920,901 
Compensation and benefits3,119,399 1,591,964 
General and administrative771,381 360,016 
Sales and marketing 30,795 120,056 
Sales returns and allowances1,793,811 2,284,175 
Medicaid rebates118,655 118,271 
Lease liability, current426,346 155,815 
Other110,239 89,054 
Accrued expenses and other current liabilities$11,309,721 $5,640,252 

The increase in accrued research and development expenses to $4.9 million as of December 31, 2020 was driven by an increase in manufacturing, regulatory and clinical activities to support the advancement of our expanded and maturing pipeline.