Restricted stock liabilities recorded upon modification of the restricted stock awards and units (1,064,549 restricted stock to be purchased at $4.00 per share)

$

4,258,196

Less imputed interest

(457,462

)

Present value of restricted stock liabilities

3,800,734

Less prepayments on December 31, 2020

(177,425

)

Restricted stock liabilities

$

3,623,309

Current portion of restricted stock liabilities

$

1,627,499

Long-term portion of restricted stock liabilities

1,995,810

Total restricted stock liabilities

$

3,623,309