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Acquisition of Txcell S.A. - Summary of Unaudited Supplemental Pro Forma Information (Detail) - TxCell S.A. [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Revenue	$ 86,182	$ 39,091
Loss from operations	(86,253)	(68,221)
Net loss	$ (79,735)	$ (66,350)
Net loss per share, basic	$ (0.82)	$ (0.85)

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
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