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Revenue by Geographical Location (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue | $ 10,125 | $ 10,175 | $ 9,251 | $ 7,632 | $ 9,656 | $ 8,045 | $ 8,830 | $ 7,692 | $ 37,183 | $ 34,223 | $ 36,416
Government contracts revenue | $ 1,831 | $ 261 |  |  |  |  |  |  | 2,092 |  |
Total revenue |  |  |  |  |  |  |  |  | 39,275 | 34,223 | 36,416
BELGIUM |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 6,392 | 5,728 | 4,456
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 4,480 | 563 | 350
Government contracts revenue |  |  |  |  |  |  |  |  | 2,092 |  |
KUWAIT |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 4,415 | 1,959 | 2,557
FRANCE |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 3,485 | 7,732 | 9,184
SPAIN |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 3,360 | 4,070 | 2,776
SWITZERLAND |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 3,324 | 2,938 | 3,784
CIS |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 2,859 | 3,361 | 6,636
Other Countries |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | $ 8,868 | $ 7,872 | $ 6,673

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