5. Accrued Other Expenses (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Accrued Liabilities and Other Liabilities [Abstract]
Inventory	$ 272,401	$ 1,458,850
Payroll & related compensation	479,054	853,402
Professional fees	721,725	618,308
Royalty costs	1,587,500	1,906,439
Sales allowances	1,270,754	1,559,847
Sales and use tax	148,454	183,264
Other	467,369	884,953
Total accrued other expenses	$ 4,947,257	$ 7,465,063