Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Changes in Fair Value of Company's Earn-Out Liability (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Earn-out payments to MUSA $ (680,941) $ 0
Level 3 Inputs    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at December 31, 2017 4,833,850  
Earn-out payments to MUSA (680,941)  
Change in fair value during the period 154,060  
Balance at March 31, 2018 $ 4,306,969