STOCK-BASED COMPENSATION - SUMMARY OF STOCK OPTIONS (Details)	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Number of options
Outstanding, beginning of period (in shares) | shares	3,966,858
Granted (in shares) | shares	1,274,900
Exercised (in shares) | shares	(44,381)
Canceled and forfeited (in shares) | shares	(211,433)
Outstanding, end of period (in shares) | shares	4,985,944
Weighted average exercise price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 4.67
Granted (in dollars per share) | $ / shares	8.18
Exercised (in dollars per share) | $ / shares	3.23
Canceled and forfeited (in dollars per shares) | $ / shares	7.51
Outstanding, end of period (in dollars per share) | $ / shares	$ 5.46