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Revenue from Significant Customers (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Concentration Risk [Line Items] |  |
Total revenue | $ 44,830 | $ 30,590
GE Healthcare |  |
Concentration Risk [Line Items] |  |
Total revenue | 7,717 |
MilliporeSigma |  |
Concentration Risk [Line Items] |  |
Total revenue | $ 6,465 |

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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