Stock Options (Details) (USD $)
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3 Months Ended | 12 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Allocated Share-based Compensation Expense | $ 262,000 | $ 154,000 | $ 1,437,000 |
Research and development expense [Member]
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Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Allocated Share-based Compensation Expense | 224,000 | 112,000 | 191,000 |
General and administrative expense [Member]
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Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
Allocated Share-based Compensation Expense | $ 38,000 | $ 42,000 | $ 1,246,000 |