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Commitments and Contingencies (Detail Textuals) (USD $)
1 Months Ended 12 Months Ended
Nov. 30, 2013
Oct. 31, 2000
Dec. 31, 2014
Dec. 31, 2013
Leases, related disclosures        
Rent expense, net     $ 500,000us-gaap_OperatingLeasesRentExpenseNet $ 800,000us-gaap_OperatingLeasesRentExpenseNet
Lease term for research and development facility   25 years    
Term of sublease 1 year      
Sublease income recognized     $ 100,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue $ 23,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue