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Summary of Significant Accounting Policies - Summary of Impact to Statement of Operations in Accordance with New Revenue Standard Requirements (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Statements of Operations |  |
Testing revenue | $ 10,604 | $ 7,902
Product revenue | 3,307 | 3,667
License and other revenue | 142 | 15
Total revenue | 14,053 | $ 11,584
ASU 2014-09 [Member] |  |
Statements of Operations |  |
Testing revenue | 10,604 |
Product revenue | 3,307 |
License and other revenue | 142 |
Total revenue | 14,053 |
ASU 2014-09 [Member] | Balances Without the Adoption of ASC 606 [Member] |  |
Statements of Operations |  |
Testing revenue | 10,592 |
Product revenue | 3,307 |
License and other revenue | 142 |
Total revenue | 14,041 |
ASU 2014-09 [Member] | Revenue Impact of Adoption of ASC 606 [Member] |  |
Statements of Operations |  |
Testing revenue | 12 |
Product revenue | 0 |
License and other revenue | 0 |
Total revenue | $ 12 |

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- Definition Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period. + 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(d),(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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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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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + 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(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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