General form of registration statement for all companies including face-amount certificate companies

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.21.2
Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 6 Months Ended 12 Months Ended
Aug. 24, 2020
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
yr
Dec. 31, 2019
USD ($)
Accounting Policies [Line Items]          
Concentration Risk, Percentage   94.00%   89.00%  
Percentage of Voting interest held by company   one one one one
Investment, Fair Value       $ 5,200  
Deconsolidation of net liabilities of fully owned subsidiary due to loss of control       1,713  
Gain on deconsolidation of subsidiary       6,904  
Income from equity method investment   $ 8,891 $ 0 5,799  
Advertising expenses       $ 100 $ 100
SummerBio, LLC [Member]          
Accounting Policies [Line Items]          
Percentage of Voting interest held by company 61.5     45.5  
Series A Preferred Stock [Member] | Measurement Input, Offered Price [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input       0.375  
Series A Preferred Stock [Member] | Measurement Input, Discount for Lack of Marketability [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input       14.4  
Series A Preferred Stock [Member] | Measurement Input, Expected Term [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input | yr       5  
Series A Preferred Stock [Member] | Measurement Input, Risk Free Interest Rate [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input       0.28  
Series A Preferred Stock [Member] | Measurement Input, Price Volatility [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input       39.5  
Maximum [Member] | Computer Software, Intangible Asset [Member]          
Accounting Policies [Line Items]          
Intangible assets useful life   5 years      
Maximum [Member] | Series A Preferred Stock [Member] | Measurement Input, Option Volatility [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input       100  
Minimum [Member] | Computer Software, Intangible Asset [Member]          
Accounting Policies [Line Items]          
Intangible assets useful life   3 years      
Minimum [Member] | Series A Preferred Stock [Member] | Measurement Input, Option Volatility [Member]          
Accounting Policies [Line Items]          
Equity Securities, FV-NI, Measurement Input       19.2