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Simple Agreements for Future Equity (SAFE) (Detail) - USD ($) |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 24, 2019 | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2017
Disclosure of Simple Agreements for Future Equity [Line Items] |  |  |  |  |  |
Loss in fair value of equity investment |  |  | $ (24,215,000) | $ (12,345,000) |  |
Payments of Financing Costs |  | $ 361,000,000 |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |
Disclosure of Simple Agreements for Future Equity [Line Items] |  |  |  |  |  |
Preferred stock issued | 5,053,022 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Disclosure of Simple Agreements for Future Equity [Line Items] |  |  |  |  |  |
Preferred stock issued | 264,990 |  |  |  |  |
Shares, Outstanding |  | 10,244,043 | 10,244,043 | 9,855,336 | 10,244,043 | 9,337,270
SAFEs [Member] |  |  |  |  |  |
Disclosure of Simple Agreements for Future Equity [Line Items] |  |  |  |  |  |
Shares, Issued |  | 0 |  |  |  |
Shares, Outstanding |  |  | 0 |  |  |
Loss in fair value of equity investment |  | $ 24,200,000 |  |  |  |
Notes Payable |  | 5,600,000 | $ 5,600,000 |  |  |
Payments of Financing Costs |  | $ 79,000 | $ 79,000 |  |  |

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- Definition The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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