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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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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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