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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Stockholders' Equity Note [Abstract]  
Summary of Stock Option Activity

Weighted

Average

Weighted

Remaining

Average

Contractual

Aggregate

Number of

Exercise

Life

Intrinsic

    

Options

    

Price

    

(in Years)

    

Value

Outstanding at January 1, 2021

 

7,179,375

$

3.14

 

4.93

$

Granted

 

490,390

 

1.88

 

  

 

  

Canceled

 

(8,050)

 

1.86

 

  

 

  

Exercised

 

(92,820)

 

1.76

 

  

 

  

Expired/Forfeited

 

(1,721,070)

 

5.63

 

  

 

  

Outstanding at June 30, 2021, and expected to vest

 

5,847,825

$

2.33

 

5.78

$

2,792,000

Exercisable at June 30, 2021

 

1,963,658

$

3.42

 

2.33

$

Summary of Stock Option Activity for Non-Vested Options

    

    

Weighted

 Average 

Number of

Grant Date 

    

Options

    

Fair Value

Balance at January 1, 2021

 

4,116,167

$

0.08

Granted

 

490,390

 

0.40

Vested

 

(647,390)

0.43

Forfeited or Canceled

 

(75,000)

 

0.08

Balance at June 30, 2021

 

3,884,167

$

0.06

Summary of Warrant Activity

Weighted

Average

Weighted

Remaining

 

Average

 

Contractual

Aggregate

Number of

Exercise

 

Life

Intrinsic

    

Warrants

    

Price

    

(in Years)

    

Value

Outstanding and exercisable at January 1, 2021

 

579,815

$

4.63

 

1.32

$

Granted

 

 

 

 

  

Canceled

 

 

 

 

  

Exercised

 

 

 

 

  

Expired/Forfeited

 

 

 

 

  

Outstanding and exercisable at June 30, 2021

 

579,815

$

4.63

 

0.82

$

Summary of Restricted Stock Activity

Weighted

Number of

Average

Restricted

Grant Date

    

Shares

    

Fair Value

Outstanding at January 1, 2021

 

780,833

$

4.09

Granted

 

245,224

 

1.65

Canceled

 

 

Vested

 

(195,224)

 

1.58

Expired/Forfeited

 

 

Outstanding at June 30, 2021

 

830,833

$

3.96