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Commitments (Details Textual) (USD $) | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Pennsylvania Office [Member] sqft | Feb. 29, 2012 Pennsylvania Office [Member] sqft | Jan. 31, 2012 Pennsylvania Office [Member] sqft | Dec. 31, 2012 San Diego Office [Member] sqft
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Area of leased office space |  |  |  | 8,761 |  | 6,442 | 13,000
Area of additional leased office space |  |  |  |  | 2,319 |  |
Annual rent for first year | $ 376,000 |  |  | $ 122,000 |  |  | $ 221,000
Annual rent for second year | 191,000 |  |  | 126,000 |  |  | 255,000
Annual rent for third year | 188,000 |  |  | 175,000 |  |  | 184,000
Annual rent for the fourth year | 187,000 |  |  | 180,000 |  |  |
Annual rent for the fifth year | 92,000 |  |  | 184,000 |  |  |
Annual rent for the sixth year |  |  |  | 188,000 |  |  |
Annual rent for the seventh year |  |  |  | 193,000 |  |  |
Lease renewal option, term |  |  |  | 3 years |  |  | 5 years
Rent expense, net | 444,000 | 430,000 | 607,000 |  |  |  |
Sublease income | $ 0 | $ 0 | $ 269,000 |  |  |  |

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