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Commitments (Details Textual) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Pennsylvania Office [Member] sqft | Apr. 30, 2013 San Diego Office [Member] sqft | Dec. 31, 2013 San Diego Office [Member] | Apr. 30, 2013 Minimum [Member] San Diego Office [Member] | Apr. 30, 2013 Maximum [Member] San Diego Office [Member]
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Area of leased office space |  |  |  | 8,761 |  |  |  |
Lease renewal option, term |  |  |  | 3 years |  |  |  |
Area of additional leased office space |  |  |  |  | 26,500 |  |  |
Initial lease term |  |  |  |  | 10 years |  |  |
Monthly payments under the lease |  |  |  |  |  |  | $ 0 | $ 82,945
Security deposit |  |  |  |  | 64,000 |  |  |
Leasehold improvements |  |  |  |  |  | 2,300,000 |  |
Rent expense, net | $ 906,000 | $ 444,000 | $ 430,000 |  |  |  |  |

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- Definition Initial Lease Term + References No definition available. + Details
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- Definition Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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