SHARE-BASED COMPENSATION - Restricted Stock Units (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Weighted Average Remaining Contractual Term (Years)
Weighted average remaining contractual terms, vested and deferred	1 year 2 months 12 days
RSUs
Number of Restricted Stock Units
Beginning of period balance (in shares)	3,861
Number of RSUs granted (in shares)	580
Number of RSUs released (in shares)	(1,269)
Number of RSUs forfeited (in shares)	(139)
End of period balance (in shares)	3,861	3,033
RSUs vested and expected to vest (in shares)		3,033
RSUs exercisable (vested and deferred) (in shares)		41
Weighted average remaining recognition period in years	2 years 3 months 18 days
Unamortized compensation expense	$ 16,106
Weighted Average Purchase Price
Options weighted average purchase price (in dollars per shares)		$ 0
Vested and expected to vest weighted average purchase price (in dollars per shares)		0
Other than options weighted average purchase price exercisable, (in dollars per shares)		$ 0
Weighted Average Remaining Contractual Term (Years)
Weighted average remaining contractual terms	1 year 6 months
Weighted average remaining contractual terms, vested and expected	1 year 6 months
Weighted average remaining contractual terms, vested and deferred	0 years
Intrinsic Value
Aggregate intrinsic value of restricted stock units		$ 4,913
Aggregate intrinsic vested and expected to vest		4,913
Aggregate intrinsic (vested and deferred)		$ 67