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RESTRUCTURINGS (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 9 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Employee Severance And Other Benefits
Dec. 31, 2013
Asset Write Downs
Dec. 31, 2013
Facility Related Charges
Apr. 25, 2013
April 2013 Restructuring
position
Dec. 31, 2013
April 2013 Restructuring
Dec. 31, 2013
April 2013 Restructuring
One-time termination benefits
Dec. 31, 2013
April 2013 Restructuring
One-time termination benefits and facility-related charges
Dec. 31, 2013
April 2013 Restructuring
Asset Write Downs
Dec. 31, 2013
April 2013 Restructuring
Facility Related Charges
Dec. 03, 2012
December 2012 Restructuring
position
Jun. 30, 2013
December 2012 Restructuring
item
Dec. 31, 2013
December 2012 Restructuring
Dec. 31, 2012
December 2012 Restructuring
Dec. 03, 2012
December 2012 Restructuring
One-time termination benefits
Dec. 03, 2012
December 2012 Restructuring
Asset Write Downs
Jun. 30, 2012
November 2011 Restructuring
item
Dec. 31, 2012
November 2011 Restructuring
Dec. 31, 2011
November 2011 Restructuring
Nov. 14, 2011
November 2011 Restructuring
position
Dec. 31, 2011
November 2011 Restructuring
One-time termination benefits
Dec. 31, 2011
November 2011 Restructuring
Asset Write Downs
RESTRUCTURINGS                                                    
Number of positions eliminated, inception to date                 20           43                 66    
Proceeds from sales of property and equipment     $ 1,196,000 $ 170,000                   $ 1,080,000                        
Number of employees who continued to provide services                               10         14          
Outstanding restructuring liability                                                    
Accrual balance at the beginning of the period     1,972,000     1,972,000                                        
Restructuring charges 430,000 2,702,000 1,462,000 2,702,000 5,449,000 716,000 200,000 546,000   1,370,000 624,000   200,000 546,000 2,794,000   92,000 2,702,000 2,523,000 271,000     5,449,000   4,575,000 874,000
Stock-based compensation expense related to extension of the post-termination exercise period                     28,000               107,000           174,000  
Expected cash payments                 1,087,000                                  
Cash payments     (2,911,000)     (2,438,000)   (473,000)       993,000         2,271,000         4,165,000        
Adjustments or non-cash credits, including stock-based compensation expense     (429,000)     (229,000) (200,000)                                      
Accrual balance at the end of the period $ 94,000 $ 1,972,000 $ 94,000 $ 1,972,000   $ 21,000   $ 73,000