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Notes Receivables - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income recognized $ 2,498 $ 1,974  
Funding of notes receivable 2,090 8,000 $ 18,748
Notes Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income recognized $ 2,498 $ 1,974  
Unsecured Non-Convertible Note [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of interest rate increase at the event of default 10.00%    
Unsecured non-convertible note maturity date Dec. 29, 2021    
Interest rate 5.00%    
Unsecured Convertible Note [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Funding of notes receivable $ 2,090    
Interest rate 3.00%    
Qualified Financing [Member] | Unsecured Convertible Note [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt instrument, convertible, terms of conversion feature at a price per share equal to 80% of the price per share sold in such transaction.    
Non Qualified Non Corporate [Member] | Unsecured Convertible Note [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt instrument, convertible, terms of conversion feature convertible notes are repaid at a rate of 1.25 times the outstanding principal amount, plus accrued and unpaid interest.    
Corporate Transaction [Member] | Unsecured Convertible Note [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt instrument, convertible, terms of conversion feature convertible notes would be repaid in cash from the proceeds of such transaction in the amount of 1.5 times the outstanding principal amount, plus any accrued and unpaid interest