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Acquisition of Txcell S.A. - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
$ / shares
Nov. 23, 2018
shares
Oct. 01, 2018
€ / shares
Oct. 01, 2018
USD ($)
$ / shares
shares
Jul. 20, 2018
Business Acquisition [Line Items]                  
Purchase price per share | $ / shares               $ 2.99  
Number of shares not purchased by the acquirer | shares           11,981,867      
Goodwill impairments       $ 0 $ 0        
TxCell S.A.                  
Business Acquisition [Line Items]                  
Number of ordinary shares acquired | shares 13,519,036   11,528,635            
Percentage of share capital and voting rights acquired     98.20%   98.20%        
Purchase price per share | $ / shares     $ 2.94   $ 2.94     $ 2.99  
Loan deemed to be part of purchase consideration $ 5,200,000 $ 5,200,000              
Cash paid to ordinary shares acquired   40,500,000              
Fair value of consideration payable   200,000   $ 600,000          
Purchase consideration 45,911,000 45,900,000 $ 33,900,000   $ 80,400,000        
Fair value percentage at acquirer recognizes and consolidates assets acquired, liabilities assumed, and any non-controlling interest               100.00%  
Consideration payable $ 45,911,000 $ 45,900,000 33,900,000   80,400,000        
Number of remaining outstanding share owned by sellers | shares       453,000          
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement                  
Business Acquisition [Line Items]                  
Percentage of equity interests agreed to acquire                 100.00%
Purchase price per share | (per share)             € 2.58 $ 2.99  
Number of free shares held by the holders (in shares) | shares               477,000  
Exchange rate on purchase price 1.16                
Estimated fair value liability of free shares               $ 200,000  
Estimated fair value asset of free shares       $ 400,000          
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement | Option Pricing Method                  
Business Acquisition [Line Items]                  
Estimated fair value liability of free shares     $ 200,000   $ 200,000     $ 200,000  
TxCell S.A. | Share Purchase Agreement and Tender Offer Agreement | Minimum                  
Business Acquisition [Line Items]                  
Purchase price per share | € / shares             € 2.58    
TxCell S.A. | SPA                  
Business Acquisition [Line Items]                  
Number of ordinary shares acquired | shares 13,519,036                
Percentage of share capital and voting rights acquired               53.00%