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Revenue by Geographical Location (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue | $ 16,240 | $ 10,797 | $ 9,525 | $ 7,006 | $ 10,125 | $ 10,175 | $ 9,251 | $ 7,632 | $ 43,568 | $ 37,183 | $ 34,223
Government contract revenue | $ 2,378 | $ 2,285 | $ 1,667 | $ 1,428 | $ 1,831 | $ 261 |  |  | 7,758 | 2,092 |
Total revenue |  |  |  |  |  |  |  |  | 51,326 | 39,275 | 34,223
FRANCE |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 9,692 | 3,485 | 7,732
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 6,316 | 4,480 | 563
Government contract revenue |  |  |  |  |  |  |  |  | 7,758 | 2,092 |
BELGIUM |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 6,263 | 6,392 | 5,728
SPAIN |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 3,432 | 3,360 | 4,070
KUWAIT |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | 2,788 | 4,415 | 1,959
Other Countries |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenue |  |  |  |  |  |  |  |  | $ 15,077 | $ 15,051 | $ 14,171

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