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Subsequent Events - Additional Information (Detail) - TxCell S.A. [Member] - EUR (€) € / shares in Units, € in Millions | Jul. 20, 2018 | Nov. 01, 2018 | Oct. 01, 2018
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Subsequent Event [Line Items] |  |  |
Percentage of share capital and voting rights owned after completion of offer | 95.00% |  |
Share Purchase Agreement and Tender Offer Agreement [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Percentage of equity interests expected to acquire | 100.00% |  |
Consideration payable | € 72 |  |
Share Purchase Agreement [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Purchase price per share |  | € 2.58 | € 2.58
Number of shares owned by sellers |  |  | 13,519,036
Percentage of share capital and voting rights held by sellers |  |  | 53.00%
Percentage of share capital and voting rights owned after completion of offer |  |  | 80.00%
Tender Offer Agreement [Member] | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of free shares held by the holders |  | 495,396 |
Tender Offer Agreement [Member] | Subsequent Event [Member] | 2018 Equity Incentive Plan [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Number of common stock available for grant |  | 150,000 |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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