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Net Revenue by Geographical Location (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue, Major Customer [Line Items]                      
Product revenue $ 9,232 $ 10,542 $ 10,150 $ 9,733 $ 10,528 $ 8,252 $ 9,224 $ 8,691 $ 39,657 $ 36,695 $ 30,602
Government grants and cooperative agreements               91 0 91 2,442
Total revenue                 39,657 36,786 33,044
FRANCE
                      
Revenue, Major Customer [Line Items]                      
Product revenue                 7,030 7,321 7,385
SPAIN
                      
Revenue, Major Customer [Line Items]                      
Product revenue                 7,033 7,061 6,504
CIS
                      
Revenue, Major Customer [Line Items]                      
Product revenue                 8,220 8,016 3,754
BELGIUM
                      
Revenue, Major Customer [Line Items]                      
Product revenue                 3,971 4,016 3,703
SWITZERLAND
                      
Revenue, Major Customer [Line Items]                      
Product revenue                 4,078 3,866 3,315
Other Countries
                      
Revenue, Major Customer [Line Items]                      
Product revenue                 9,325 6,415 5,941
UNITED STATES
                      
Revenue, Major Customer [Line Items]                      
Government grants and cooperative agreements                   $ 91 $ 2,442