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9. ACCRUED OTHER EXPENSES | 12 Months Ended
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Dec. 31, 2020
Accrued Other Expenses |
ACCRUED OTHER EXPENSES | Accrued other expenses for the years ended December 31, 2020 and 2019 consisted of the following:
|  | December 31, 2020 |  |  | December 31, 2019 |
Inventory purchases |  | $ | 1,458,850 |  |  | $ | - |
Payroll and related benefit costs |  |  | 853,402 |  |  |  | 151,473 |
Professional fees |  |  | 618,308 |  |  |  | 105,493 |
Royalty costs |  |  | 1,906,439 |  |  |  | 1,125,000 |
Contract liabilities* |  |  | 1,559,847 |  |  |  | 901,196 |
Sales and use tax |  |  | 183,264 |  |  |  | 148,836 |
Other |  |  | 884,953 |  |  |  | 234,473 |
Total accrued other expenses |  | $ | 7,465,063 |  |  | $ | 2,666,471 |
* Contract liabilities include sales allowances given to customers. A related inventory contract asset stemming from the sales return reserve of $366 thousand and $376 thousand is included within inventories on the accompanying consolidated balance sheets as of December 31, 2020 and 2019, respectively.

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