Accrued Expenses  | 
9 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2019  | 
Dec. 31, 2018  | 
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| Accrued Liabilities [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accrued Expenses | 
 6. ACCRUED EXPENSES 
 Accrued expenses are comprised of the following: 
 
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 9. ACCRUED EXPENSES 
 Accrued expenses are comprised of the following: 
 
 
 During May 2015, the Company entered into a payment plan, under which it agreed to pay its Argentine payroll tax obligations over a period of 36 months. The current portion of payments due under the plan is $113,670 and $230,506 as of December 31, 2018 and 2017, respectively, which is included in accrued compensation and payroll taxes above. The non-current portion of accrued expenses represents payments under the plan that are scheduled to be paid after twelve months. The Company incurred interest expenses of $52,209 and $113,679 during the years ended December 31, 2018 and 2017, respectively, related to this payment plan.  | 
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