Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Summary of Changes in Revenue Contract Liability (Details)

v3.19.1
REVENUE RECOGNITION - Summary of Changes in Revenue Contract Liability (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
Revenue From Contract With Customer [Abstract]  
Beginning balance – December 31, 2018 $ 1,438,492
Increase (advanced billings) 3,877,619
Decrease (revenue recognition) (3,960,275)
Ending balance – March 31, 2019 $ 1,355,836