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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Recently Issued Accounting Guidance (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Credit to Tax Provision |  | $ 3,778,000 |  |  | $ 3,654,000 | $ 11,975,000 | $ 10,634,000 |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Credit to Tax Provision |  | $ 242,000 | $ 233,000 | $ 323,000 |  |  |  |
Per Share |  | $ 0.02 | $ 0.02 | $ 0.03 |  |  |  |
Accounting Standards Update 2016-09 [Member] | Forecast [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Credit to Tax Provision | $ 198,500 |  |  |  |  |  |  | $ 996,500
Per Share | $ 0.02 |  |  |  |  |  |  | $ 0.09

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