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Common Stock Warrants - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2020 | Jun. 24, 2019 | Mar. 22, 2019 | Aug. 31, 2011
Common Stock Warrants [Line Items] |  |  |  |  |  |
Warrant issued to purchase stock |  |  |  | 188,643 |  |
Common stock issued for exercise of warrant |  | 19,069 | 40,357 |  |  |
TriplePoint Capital LLC |  |  |  |  |  |
Common Stock Warrants [Line Items] |  |  |  |  |  |
Estimated fair value of warrants |  |  |  |  | $ 0.6 |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |
Common Stock Warrants [Line Items] |  |  |  |  |  |
Estimated fair value of warrants |  |  |  |  |  | $ 0.1
Common Stock | TriplePoint Capital LLC |  |  |  |  |  |
Common Stock Warrants [Line Items] |  |  |  |  |  |
Warrant issued to purchase stock |  |  |  |  | 65,502 |
Warrant exercise price per share |  |  |  |  | $ 9.16 |
Common stock issued for exercise of warrant | 39,415 |  |  |  |  |
Common Stock | Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |
Common Stock Warrants [Line Items] |  |  |  |  |  |
Warrant issued to purchase stock |  |  |  |  |  | 188,643
Warrant exercise price per share |  |  |  |  |  | $ 0.04
Warrants outstanding | 0 |  | 0 |  |  |

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- Definition Common stock warrants. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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