SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Recent Accounting Pronouncements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit from exercise of stock options and vesting of restricted common stock	$ 61,000	$ 13,000	$ 0
Forecast | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset				$ 5,000,000
Lease liability				$ 5,000,000