As of

June 30, 2021

December 31, 2020

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

$

4,258,196

Less imputed interest

(457,462

)

(457,462

)

Present value of restricted stock liabilities

3,800,734

Less payments (excluding imputed interest)

(893,427

)

(177,425

)

Restricted stock liabilities

$

2,907,307

$

3,623,309

Current portion of restricted stock liabilities

$

1,879,506

$

1,627,499

Long-term portion of restricted stock liabilities

1,027,801

1,995,810

Total restricted stock liabilities

$

2,907,307

$

3,819,560