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Assets Held for Sale (Textual) (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Jun. 30, 2013
Assets Held for Sale [Abstract]          
Asset impairment charges     $ 1,571    
Research & development equipment reclassified as held for use   333      
Loss on exchange of assets   188      
Change in estimated fair value of research equipment   568      
Assets held for sale 1,394 292 2,179 292  
Long Lived Assets Held-for-sale [Line Items]          
Proceeds from sale of property and equipment 779     187 0
Gain (Loss) on Disposition of Property Plant Equipment       78 (141)
UNITED STATES [Member]
         
Long Lived Assets Held-for-sale [Line Items]          
Proceeds from sale of property and equipment       4  
Gain (Loss) on Disposition of Property Plant Equipment       $ 2