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RESTRUCTURINGS (Details) (USD $) | 3 Months Ended | 9 Months Ended | 0 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Employee Severance And Other Benefits | Sep. 30, 2013 Asset Write Downs | Sep. 30, 2013 Facility Related Charges | Apr. 25, 2013 April 2013 Restructuring position | Sep. 30, 2013 April 2013 Restructuring | Sep. 30, 2013 April 2013 Restructuring One-time termination benefits | Sep. 30, 2013 April 2013 Restructuring Asset Write Downs | Sep. 30, 2013 April 2013 Restructuring Facility Related Charges | Sep. 30, 2013 April 2013 Restructuring One-time termination benefits and facility-related charges | Dec. 31, 2012 December 2012 Restructuring | Jun. 30, 2013 December 2012 Restructuring | Sep. 30, 2013 December 2012 Restructuring | Dec. 03, 2012 December 2012 Restructuring position | Nov. 14, 2011 November 2011 Restructuring position
RESTRUCTURINGS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of full-time positions eliminated, inception to date |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  | 43 | 66
Aggregate estimated restructuring charges |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |
Expected cash payments |  |  |  |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  |  |
Proceeds from sales of property and equipment |  | 1,116,000 | 38,000 |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Outstanding restructuring liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual balance at the beginning of the period |  | 1,972,000 |  | 1,972,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 116,000 | 1,032,000 |  | 716,000 | 200,000 | 116,000 |  | 940,000 | 624,000 | 200,000 | 116,000 |  | 2,702,000 | 92,000 | 2,794,000 |  |
Stock-based compensation expense related to extension of the post-termination exercise period |  |  |  |  |  |  |  |  | 28,000 |  |  |  |  |  |  |  |
Cash payments |  | (2,469,000) |  | (2,373,000) |  | (96,000) |  |  |  |  |  | (571,000) |  |  |  |  |
Adjustments or non-cash credits, including stock-based compensation expense |  | (374,000) |  | (174,000) | (200,000) |  |  |  |  |  |  |  |  |  |  |  |
Accrual balance at the end of the period | $ 161,000 | $ 161,000 |  | $ 141,000 |  | $ 20,000 |  |  |  |  |  |  |  |  |  |  |

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