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Fair Value Measurements - Additional Information (Detail) - TxCell S.A. - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Nov. 23, 2018
Oct. 01, 2018
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]          
Number of shares acquired (in shares)   13,519,036 111,000 11,528,635  
Share Purchase Agreement and Tender Offer Agreement          
Debt Securities, Available-for-sale [Line Items]          
Number of free shares held by the holders (in shares)   477,000 477,000   477,000
Estimated fair value liability of free shares   $ 0.2      
Number of shares acquired (in shares) 11,528,635   111,000 25,047,671  
Cash payments to acquire free shares     $ 0.3    
Number of free shares outstanding subject to purchase (in shares)     366,000    
Increase in fair value of free shares         $ 0.5
Fair value Of free shares purchased         0.1
Estimated fair value asset of free shares     $ 0.2   $ 0.2
Valuation Technique, Option Pricing Model | Share Purchase Agreement and Tender Offer Agreement          
Debt Securities, Available-for-sale [Line Items]          
Estimated fair value liability of free shares   $ 0.2   $ 0.2