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Fair Value Measurements - Summary of Estimated Fair Value of Free Shares Valuation Assumptions (Detail)	Sep. 30, 2019 $ / shares € / shares € / $	Dec. 31, 2018 $ / shares € / shares € / $
Stock Price (USD per share)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input | $ / shares	9.05	11.48
Exchange Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input | € / $	0.91	0.87
Stock Price Volatility Estimate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input	75.0	79.9
EUR / USD Exchange Rate Volatility Estimate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input	6.8	7.7
TxCell S.A. | Stock Price (USD per share)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input | € / shares	2.23	2.58
TxCell S.A. | Stock Price Correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input	100.0	0
TxCell S.A. | Stock Price Volatility Estimate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Free shares measurement input	75.0	8.6

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Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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