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Stock based compensation, options and warrants (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Recognized Stock-based Compensation

The Company recognized total stock-based compensation expense during the three and six months ended June 30, 2019 and 2018 granted under the Company’s 2017 equity incentive plan (the “Plan”), from the following categories:

 

   Three Months Ended  June 30,  Six Months Ended June 30,
   2019  2018  2019  2018
Restricted stock awards under the Plan  $115,026   $1,432,593   $291,570   $2,199,542 
Stock option awards under the Plan   —      175,493    58,498    292,487 
    Total stock-based compensation  $115,026   $1,608,086   $350,068   $2,492,029
Summary of Restricted Plan Activity

A summary of the Company’s unvested restricted stock activity in the six months ended June 30, 2019 is presented here:

 

   Number of Shares  Weighted Average Grant-Date
 Fair Value
 Unvested at January 1, 2019    95,939   $12.49 
     Vested    (37,459)  $8.01 
     Granted    24,500   $5.11 
     Forfeited    (40,000)  $16.82 
 Unvested at June 30, 2019    42,980   $7.43
Summary of Stock Incentive Plan Activity

A summary of activity under the Plan for the six months ended June 30, 2019 is presented below:

 

   Shares Underlying Options  Weighted Average Exercise Price  Weighted Average Remaining Contractual
 Term (Years)		  Aggregate Intrinsic Value
 Outstanding at January 1, 2019    62,000   $15.71    9.2   $—   
      Forfeited    (50,000)  $18.50    —      —   
 Outstanding at June 30, 2019    12,000   $4.09    9.2   $—   
                       
 Exercisable at June 30, 2019    12,000   $4.09    9.2   $—
Schedule of Changes in Outstanding Warrants

Following is a summary of outstanding warrants that were issued outside of the Plan for the six months ended June 30, 2019:

 

   Shares Underlying Options/Warrants  Weighted Average Exercise Price  Weighted Average Remaining Contractual
 Term (Years)		  Aggregate Intrinsic Value
 Outstanding at January 1, 2019    1,671,113   $39.47    2.0   $—   
 Granted    1,908,144   $1.94    5.2   $2,537,832 
 Forfeited    (5,000)  $7.90    —     $—   
 Outstanding at June 30, 2019    3,574,257   $19.48    3.4   $2,289,773 
                       
 Exercisable at June 30, 2019    1,928,144   $19.48    0.7   $—