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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Schedule of financial assets measured at fair value on nonrecurring basis
   As of March 31, 2019 
   Level 1   Level 2   Level 3   Total 
Assets:                
Cash and money market accounts  $10,584,067   $—   $—   $10,584,067 
Interest rate swaps   —    4,117    —    4,117 
Total  $10,584,067   $4,117   $—   $10,588,184 

 

   As of December 31, 2018 
   Level 1   Level 2   Level 3   Total 
Assets:                
Cash and money market accounts  $2,521,050   $—   $—   $2,521,050 
Interest rate swaps   —    40,209    —    40,209 
Total  $2,521,050   $40,209   $—   $2,561,259 
Schedule of sales to significant customers
   During the Three-Month
Periods Ended March 31,		 
   2019   2018 
Company A   43%   34%
Company B   27%   24%
Company C   *    11%

 

*Amount is less than 10%
Schedule of accounts receivable due from significant customers
   As of
March 31,
2019		   As of
December 31,
2018		 
Company A   42%   35%
Company B   29%   36%
Company C   13%   15%