Other current liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued payroll, bonuses and commission costs	$ 8,758,073	$ 8,040,278
Allowance for coupons and returns	6,770,206	10,316,298
Accrued sales and marketing costs	227,500	3,285,662
Accrued compensated absences	2,353,996	1,463,878
Allowance for wholesale distributor fees	2,632,432	2,347,122
Accrued legal and accounting expense	898,568	422,336
Accrued research and development	925,314	1,049,603
Operating lease liability	2,253,994	1,501,539
Accrued rebates	11,010,588	3,916,672
Other accrued expenses	2,339,198	1,480,225
TOTAL OTHER CURRENT LIABILITIES	$ 38,169,869	$ 33,823,613