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Fair Value Measurements - Additional Information (Detail) - TxCell S.A. [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Oct. 01, 2018
Schedule Of Available For Sale Securities [Line Items]
Liability recorded on acquisition date		$ 4,933
Share Purchase Agreement and Tender Offer Agreement [Member]
Schedule Of Available For Sale Securities [Line Items]
Number of free shares held by the holders		477,000
Liability recorded on acquisition date		$ 200
Increase in fair value of free shares	$ 500

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Business acquisition, number of free shares held by the holders.

+ References

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- Definition

Increase in fair value of free shares asset and liability.

+ References

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- Definition

Amount of liabilities assumed at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

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- Definition

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