SHARE-BASED COMPENSATION - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Number of Options [Roll Forward]
Number of options outstanding, beginning of period (in shares) | shares	15,326,350
Number of options, granted (in shares) | shares	4,576,163
Number of options, exercised (in shares) | shares	(2,717,053)
Number of options, forfeited (in shares) | shares	(885,692)
Number of options, expired or canceled (in shares) | shares	(6,000)
Number of options outstanding, end of period (in shares) | shares	16,293,768
Number of options, exercisable at end of period (in shares) | shares	5,686,232
Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, beginning of period (in dollars per share) | $ / shares	$ 7.68
Weighted average exercise price, granted (in dollars per share) | $ / shares	16.15
Weighted average exercise price, exercised (in dollars per share) | $ / shares	5.28
Weighted average exercise price, forfeited (in dollars per share) | $ / shares	10.88
Weighted average exercise price, expired or canceled (in dollars per share) | $ / shares	6.22
Weighted average exercise price, end of period (in dollars per share) | $ / shares	10.29
Weighted average exercise price, exercisable at end of period (in dollars per share) | $ / shares	$ 6.87
Weighted average remaining contractual term, outstanding at end of period (in years)	7 years 9 months 16 days
Weighted average remaining contractual term, exercisable at end of period (in years)	6 years 1 month 7 days
Aggregate intrinsic value, number of options outstanding, end of period | $	$ 229,659
Aggregate intrinsic value, exercisable at end of period | $	$ 99,541