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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 |  |

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- Definition Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 + Details
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- Definition The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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