ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
ACCRUED LIABILITIES
Compensation and fringe benefits	$ 8,036	$ 9,696
Warranty reserve	762	786	$ 629
Other accrued expenses	2,721	1,848
Accrued liabilities	$ 11,519	$ 12,330