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PREPAID EXPENSES AND OTHER CURRENT ASSETS
 6 Months Ended
Jun. 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
 June 30, 2020December 31, 2019
Prepaid Inventory784,373  1,291,577  
Assets classified as held for sale774,832  —  
Vehicle trade-in credits174,630  —  
Prepaid insurance107,367  133,611  
Interest receivables93,027  80,609  
Other209,921  166,625  
Total$2,144,150  $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 June 30, 2020, consist of this old office building which we intend to sell within a one year period. The amount shown above is recorded at cost, less accumulated depreciation.