Inventory (Narrative) (Details)  | 
3 Months Ended | 
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 Mar. 31, 2015  
USD ($) 
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| Production Materials [Member] | |
| Inventory [Line Items] | |
| Inventory write-down | $ 120,000 | 
| Lymphoseek Inventory Used in Development Activity [Member] | |
| Inventory [Line Items] | |
| Inventory write-down | $ 37,000 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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