COMMITMENTS AND CONTINGENCIES - Summary of Product Warranty Accrual (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Movement in Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 1,691	$ 3,419	$ 2,539
Warranties Issued in the period	2,031	2,242	3,577
Costs to service warranties	(1,981)	(4,286)	(3,263)
Warranty accrual adjustments	45	316	566
Ending balance	$ 1,786	$ 1,691	$ 3,419