SHARE-BASED COMPENSATION - Stock Option Activity (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Private Innovate 2015 Stock Incentive Plan        
Number of Shares        
Beginning balance (in shares) 6,028,781      
Options granted (in shares) 0 0    
Options forfeited (in shares) (5,652)      
Options exercised (in shares) (22,611)      
Ending balance (in shares) 6,000,518     6,028,781
Exercisable (in shares) 6,000,518      
Vested and expected to vest (in shares) 6,000,518      
Weighted-Average Exercise Price        
Beginning balance (in dollars per share) $ 1.53      
Options granted (in usd per share) 0      
Options forfeited (in usd per share) 2.08      
Options exercised (in dollars per share) 2.08      
Ending balance (in dollars per share) 1.52     $ 1.53
Exercisable (in usd per share) 1.52      
Vested and expected to vest (in usd per share) $ 1.52      
Aggregate Intrinsic Value        
Outstanding $ 1,682,283     $ 1,080,474
Exercisable 1,682,283      
Vested and expected to vest $ 1,682,283      
Weighted-Average Remaining Contractual Life (in years)        
Outstanding (in years) 2 years 10 months 24 days   3 years 2 months 12 days  
Exercisable (in years) 2 years 10 months 24 days      
Vested and expected to vest (in years) 2 years 10 months 24 days      
For possible future issuance under the Omnibus Plan        
Number of Shares        
Beginning balance (in shares) 10,598,426      
Options granted (in shares) 3,132,130 0    
Options forfeited (in shares) (118,056)      
Options exercised (in shares) (10,704) 0    
Ending balance (in shares) 13,601,796     10,598,426
Exercisable (in shares) 4,657,871      
Vested and expected to vest (in shares) 12,856,677      
Weighted-Average Exercise Price        
Beginning balance (in dollars per share) $ 1.01      
Options granted (in usd per share) 1.78      
Options forfeited (in usd per share) 0.65      
Options exercised (in dollars per share) 0.73      
Ending balance (in dollars per share) 1.19     $ 1.01
Exercisable (in usd per share) 1.34      
Vested and expected to vest (in usd per share) $ 1.18      
Aggregate Intrinsic Value        
Outstanding $ 3,909,934     $ 1,490,488
Exercisable 1,372,237      
Vested and expected to vest $ 3,718,449      
Weighted-Average Remaining Contractual Life (in years)        
Outstanding (in years) 9 years 2 months 12 days     9 years 2 months 12 days
Exercisable (in years) 8 years 4 months 24 days      
Vested and expected to vest (in years) 9 years 1 month 6 days      
RDD Options        
Number of Shares        
Beginning balance (in shares) 1,014,173      
Options granted (in shares) 0      
Options forfeited (in shares) 0      
Options exercised (in shares) (28,366)      
Ending balance (in shares) 985,807     1,014,173
Exercisable (in shares) 985,807      
Vested and expected to vest (in shares) 985,807      
Weighted-Average Exercise Price        
Beginning balance (in dollars per share) $ 0.63      
Options granted (in usd per share) 0      
Options forfeited (in usd per share) 0      
Options exercised (in dollars per share) 0.74      
Ending balance (in dollars per share) 0.63     $ 0.63
Exercisable (in usd per share) 0.63      
Vested and expected to vest (in usd per share) $ 0.63      
Aggregate Intrinsic Value        
Outstanding $ 532,071     $ 228,860
Exercisable 532,071      
Vested and expected to vest $ 532,071      
Weighted-Average Remaining Contractual Life (in years)        
Outstanding (in years) 4 years 1 month 6 days 4 years 3 months 18 days    
Exercisable (in years) 4 years 1 month 6 days      
Vested and expected to vest (in years) 4 years 1 month 6 days