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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 09, 2019 | Feb. 01, 2019 | May 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | May 16, 2019 | Apr. 07, 2016 | Jan. 12, 2016 | Jul. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, amount authorized |  |  |  |  |  |  |  |  | $ 8,000,000.0 |  | $ 70,000,000.0 | $ 15,000,000.0
Total purchase price of common stock repurchased |  |  | $ 4,700,000 |  | $ 2,882,000 | $ 6,682,000 |  |  |  |  |  |
Repurchase of common stock (in shares) |  |  | 612,729 | 383,127 |  |  |  |  |  |  |  |
Aggregate price of common stock repurchased |  |  | $ 6,700,000 | $ 2,900,000 |  |  | $ 9,564,000 | $ 0 |  |  |  |
Stock repurchase program, amount available for future purchases |  |  |  | $ 22,400,000 | $ 22,400,000 |  | $ 22,400,000 |  |  |  |  |
2016 Plan | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized under the plan (in shares) |  |  |  |  |  |  |  |  |  | 2,500,000 |  |
Number of shares available for issuance under the plan (in shares) |  |  |  | 1,219,583 | 1,219,583 |  | 1,219,583 |  |  |  |  |
Restricted Stock | 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) | 1,117,485 | 22,603 |  |  |  |  | 1,140,088 |  |  |  |  |
Total settling fiscal performance incentive | $ 7,900,000 | $ 377,000 |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |  |  |  |
Director |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock outstanding (more than) |  |  |  |  |  |  |  |  | 5.00% |  |  |

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