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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Aspects of the Description of Business - (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2016
USD ($)
MW
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 26, 2016
USD ($)
Feb. 23, 2016
USD ($)
Jun. 29, 2015
USD ($)
Aug. 23, 2012
USD ($)
BASIS OF PRESENTATION                      
Depreciation Expense Decrease           $ 2,481          
Description of Business                      
Number of reportable segments   2     2            
Liquidity                      
Maximum borrowing capacity $ 10,000 $ 10,000 $ 10,000 $ 10,000 $ 10,000 10,000     $ 10,000    
Liquidity Requirement                 $ 3,500    
Principal amount $ 5,000 $ 5,000 $ 5,000 $ 5,000 $ 5,000 $ 5,000          
Maximum borrowing capacity of the face value of eligible A/R (as a percent) 85.00% 85.00% 85.00% 85.00% 85.00% 85.00%          
Maximum percentage of book value of inventories that may be financed 50.00% 50.00% 50.00% 50.00% 50.00% 50.00%          
Cash and cash equivalents and short-term investments $ 21,870 $ 21,870 $ 21,870 $ 21,870 $ 21,870 $ 21,870 $ 12,615        
Increase (decrease) in Cash and cash equivalents and Short-term investments           9,255          
Current borrowing capacity 17,226 17,226 17,226 $ 17,226 17,226 17,226          
Long-term Debt, Current Maturities             2,799        
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed       50.00%              
Increase (Decrease) in Customer Deposits           8,057 (12,457)        
Inventories, net 21,159 21,159 21,159 $ 21,159 21,159 21,159 24,219        
Increase (Decrease) in inventories           (3,060) (6,925)        
Total debt and capital lease obligations 4,103 4,103 4,103 4,103 4,103 4,103          
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months 465 465 465 465 465 465          
Cash and Cash Equivalents and Short-Term Investments                      
Cash and cash equivalents 18,699 18,699 18,699 18,699 18,699 18,699 6,436        
Short-term investments 3,171 3,171 3,171 3,171 3,171 3,171 6,179        
Interest income           48 10        
Restricted Cash                      
Restricted cash 39 39 39 39 39 39 83        
Improperly Assigned Cost of Certain Component Parts                      
Out-of-Period Adjustment                      
Out-of-period impact             231        
Credit facility                      
Liquidity                      
Maximum borrowing capacity $ 20,000 20,000 20,000 20,000 20,000 20,000   $ 10,000     $ 20,000
Period of line of credit 3 years                    
Maximum borrowing capacity of the face value of eligible A/R (as a percent)               85.00%     85.00%
Maximum percentage of book value of inventories that may be financed               50.00%     50.00%
Long-term Line of Credit $ 0 0 0 0 0 0          
Current borrowing capacity             $ 17,226        
Outstanding indebtedness under the Credit Facility $ 0 $ 0 $ 0 $ 0 $ 0 $ 0          
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed       50.00%              
Term Loan                      
Liquidity                      
Principal amount                   $ 5,000  
Towers                      
Description of Business                      
Number of facilities | item         2            
New Markets Tax Credit Transaction                      
Principles of Consolidation and Basis of Presentation                      
Number of VIE's | item         2            
Minimum | Towers                      
Description of Business                      
Power generating capacity of turbines that towers produced annually can support (in megawatts) | MW     1,000                
Maximum | Towers                      
Description of Business                      
Annual tower production capacity (in towers) | item         500