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PREPAID EXPENSES AND OTHER CURRENT ASSETS
 9 Months Ended
Sep. 30, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
PREPAID EXPENSES AND OTHER CURRENT ASSETS PREPAID EXPENSES AND OTHER CURRENT ASSETS
Prepaid expenses and other current assets consisted of the following at each balance sheet date:
 As of
 September 30, 2020December 31, 2019
Assets classified as held for sale791,180 — 
Prepaid Inventory659,084 1,291,577 
Prepaid insurance275,623 133,611 
Vehicle trade-in credits156,607 — 
Interest receivables64,600 80,609 
Other231,588 166,625 
Total$2,178,682 $1,672,422 

In the first quarter of 2020, we completed the construction of a new office building and research and development facility in Acheson, Canada. As a result, during the second quarter of 2020 we started the process of selling our old office building in Spruce Grove, Canada. In the table above, the assets classified as held for sale as of September 30, 2020, consist of this old office building which we intend to sell within a one year period from the most recent balance sheet date. The amount shown above is recorded at cost, less accumulated depreciation.