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Investment - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Dec. 27, 2019
Jun. 20, 2017
Jun. 30, 2020
Dec. 31, 2019
Investment [Line Items]        
Carrying value of investments     $ 11,192 $ 11,192
Thesys Group, Inc [Member]        
Investment [Line Items]        
Carrying value of investments     $ 3,080 3,080
Thesys Group, Inc [Member] | Convertible Preferred Stock [Member] | Series Y Preferred Stock [Member]        
Investment [Line Items]        
Number of shares issued   7,797,533    
Current fully diluted ownership percentage   19.00%    
Liquidation preference   $ 0.231    
Thesys Group, Inc [Member] | Warrant [Member] | Series Y Preferred Stock [Member]        
Investment [Line Items]        
Warrants to purchase shares   3,898,766    
Exercisable percentage of warrant if claim brought against Company   100.00%    
Securrency Inc [Member]        
Investment [Line Items]        
Ownership interest percentage     25.00%  
Original fully diluted ownership interest percentage     20.00%  
Percentage of voting approval required to redeem all of the outstanding Series A preferred     60.00%  
Securrency Inc [Member] | Convertible Preferred Stock [Member]        
Investment [Line Items]        
Carrying value of investments $ 8,112   $ 8,112 $ 8,112
Number of shares purchased 5,178,488      
Non-cumulative dividend 6.00%