SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share based Comp (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Nov. 30, 2010
Maximum | Total Sales
Revenue Recognition
Percentage of sales (as a percent)			10.00%
Stock Options
Options
Balance at the beginning of the period(in shares)			139,750
Granted (in shares)	0	0	0	0
Exercised (in shares)			(1,507)
Cancelled (in shares)			(59,493)
Balance at the end of the period (in shares)	78,750		78,750		139,750
Exercisable at the end of the period (in shares)	78,750		78,750
Weighted-Average Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)			$ 6.66
Exercised (in dollars per share)			3.20
Cancelled (in dollars per share)			7.18
Outstanding at the end of the period (in dollars per share)	$ 6.33		6.33		$ 6.66
Exercisable at the end of the period (in dollars per share)	$ 6.33		$ 6.33
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period			2 years 5 months 9 days
Exercisable at the end of the period			2 years 5 months 9 days
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 7,685		$ 7,685
Exercisable at the end of the period	7,685		7,685
Additional disclosures
Intrinsic value of options exercised	964	$ 8,166	964	$ 8,166
Cash received from options exercised	4,822	10,333	4,822	10,333
Compensation expense	0	$ (4,338)	994	$ (669)
Unrecognized compensation related to unvested awards	$ 0		$ 0
Equity Appreciation Rights Plan
Awards exercised (in shares)			1,507
Granted (in shares)	0	0	0	0
2010 Plan | Equity Appreciation Rights Plan
Additional disclosures
Compensation expense	$ 3,300	$ (46,000)	$ (6,400)	$ (58,000)
Equity Appreciation Rights Plan
Number of common shares authorized						1,000,000
Vesting period from the base date			3 years
Redemption cash payment period			90 days
Shares granted (in units)			0
Accrued compensation	75,000		$ 75,000		$ 143,000
2010 Plan | Equity Appreciation Rights Plan | other accrued liabilities
Equity Appreciation Rights Plan
Accrued compensation	50,000		50,000		61,000
2010 Plan | Equity Appreciation Rights Plan | other long-term liabilities
Equity Appreciation Rights Plan
Accrued compensation	$ 25,000		$ 25,000		$ 82,000