REVENUE RECOGNITION - Summary of Changes in Revenue Contract Liability (Details)  | 
9 Months Ended | 
|---|---|
| 
 Sep. 30, 2019  
USD ($) 
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| Revenue From Contract With Customer [Abstract] | |
| Beginning balance – January 1, 2019 | $ 1,438,492 | 
| Increase (advanced billings) | 11,547,925 | 
| Decrease (revenue recognition) | (11,691,737) | 
| Ending balance – September 30, 2019 | $ 1,294,680 | 
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- Definition Contract with customer decrease in revenue recognition. No definition available. 
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- Definition Contract with customer increase in advanced billings. No definition available. 
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- References No definition available. 
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