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BASIS OF PRESENTATION (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 39 Months Ended 3 Months Ended 12 Months Ended 39 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2014
Mar. 31, 2014
Non-cash charges
Dec. 31, 2013
Non-cash charges
Dec. 31, 2012
Non-cash charges
Dec. 31, 2011
Non-cash charges
Mar. 31, 2014
Non-cash charges
Mar. 31, 2014
Credit facility
Aug. 23, 2012
Credit facility
Description of Business                        
Revenue as a percentage of sales associated with new wind turbine installations 81.00%                      
BASIS OF PRESENTATION                        
Maximum borrowing capacity                       $ 20,000
Maximum borrowing capacity of the face value of eligible A/R (as a percent)                       85.00%
Maximum percentage of book value of inventories that may be financed                       50.00%
Current borrowing capacity                     15,201  
Liquidity                        
Cash and cash equivalents and short-term investments 11,396 26,079     11,396              
Minimum period for which liquidity needs will be met from current cash resources and cash to be generated from operations over the next twelve months 12 months                      
Obligation to make principal payments on outstanding debt during the next twelve months 179       179              
Restructuring charges incurred 770 5,550 5,092 874 12,286 0 3,284 1,224 297 4,805    
Expected cost to be incurred to implement the restructuring plan $ 13,270         $ 4,805