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STOCK-BASED COMPENSATION - Summary of Common Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended	12 Months Ended
	Jan. 01, 2019	Sep. 30, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 18,871	$ 1,214
Document Period End Date		Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		1,195,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 20.70
Award vesting period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,123,312
Shares (in thousands)
Beginning balance (in shares)	1,774,000	1,774,000
Granted (in shares)		39,000
Exercised (in shares)		(215,000)
Forfeited (in shares)		(28,000)
Canceled (in shares)		(65,000)
Ending balance (in shares)		1,505,000	1,774,000
Weighted-Average Exercise Price
Beginning balance (in usd per share)	$ 20.55	$ 20.55
Granted (in usd per share)		20.64
Exercised (in usd per share)		13.25
Forfeited (in usd per share)		23.82
Canceled (in usd per share)		22.36
Ending balance (in usd per share)		$ 21.46	$ 20.55
Common stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		1 year 3 months 29 days	2 years 3 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	224,662

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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