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Wind-Down Expenses (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Facility Closing In Rhode Island [Member] | Dec. 31, 2012 Facility Closing In Rhode Island [Member] | Dec. 31, 2011 Facility Closing In Rhode Island [Member]
Components of wind-down reserve |  |  |  |  |
Accrued wind-down reserve at beginning of period |  |  |  | $ 854,000 | $ 1,683,000
Less actual expenses recorded against estimated reserve during the period |  |  | (372,000) | (1,185,000) |
Additional expense recorded to revise estimated reserve at period-end |  |  | 23,000 | 356,000 |
Revised reserve at period-end |  |  | 505,000 | 854,000 |
Add deferred rent at period end | (15,575) | (19,031) | 124,000 | 249,000 |
Total accrued wind-down expenses at period-end, current |  |  | $ 629,000 | $ 1,103,000 |

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- Details
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