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Notes Receivables - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest income recognized     $ 1,856 $ 1,373  
Funding of notes receivable     1,790 8,000  
Notes Receivable [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest income recognized $ 633 $ 533 $ 1,856 $ 1,373  
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%   10.00%    
Unsecured non-convertible note maturity date     Dec. 29, 2021    
Interest rate 5.00%   5.00%    
Fair Value, Inputs, Level 2 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Fair value of unsecured non-convertible note receivable $ 30,288   $ 30,288   $ 27,618
Unsecured Convertible Note [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Funding of notes receivable     $ 1,790    
Interest rate 3.00%   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 note is 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 note 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