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Convertible Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2019 | Jan. 31, 2019 | Oct. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Temporary Equity [Line Items] |  |  |  |  |
Preferred stock, authorized shares |  |  |  | 10,000,000 | 0
Preferred stock, issued shares |  |  |  | 0 | 0
Preferred stock, outstanding shares |  |  |  | 0 | 0
Gross proceeds from convertible preferred stock |  |  |  | $ 50,000 | $ 12,744
Convertible preferred stock, authorized shares |  | 20,762,168 |  |  |
Preferred stock exchange including deemed dividend |  | $ (5,326) |  |  |
Convertible preferred stock, terms of conversion |  |  | Each share of Convertible Preferred Stock automatically converts into the number of shares of common stock determined in accordance with the conversion rate upon either: (a) the closing of a public offering of common stock at a price of at least $18.23 per share resulting in at least $50,000 of gross proceeds, or (b) written consent of a majority of the holders of the then outstanding shares of Convertible Preferred Stock. |  |
Mandatory conversion per share trigger price |  |  | $ 18.23 |  |
Gross proceed trigger price |  |  | $ 50,000 |  |
Convertible preferred stock convert into voting common stock | 6,495,015 |  |  |  |
Convertible preferred stock convert into non-voting common stock | 6,409,519 |  |  |  |
Initial Public Offering |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Convertible preferred stock, terms of conversion |  |  |  | Each 1.5 outstanding share of Convertible Preferred Stock converted into one share of common stock. |
Series A Preferred |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Convertible preferred stock, issued shares |  |  | 3,146,551 |  |
Gross proceeds from convertible preferred stock |  |  | $ 12,744 |  |
Issuance, shares |  |  |  |  | 3,146,551
Convertible preferred stock dividends per share |  |  |  | $ 0.24 |
Convertible preferred stock, outstanding shares |  |  |  |  | 3,146,551
Series B Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Gross proceeds from convertible preferred stock |  | $ 50,000 |  |  |
Issuance, shares |  | 6,963,788 |  | 6,963,788 |
Number of preferred shares in exchange |  | 1,405,332 |  | 1,405,332 |
Preferred stock exchange including deemed dividend |  | $ (10,090) |  | $ (10,090) |
Convertible preferred stock dividends per share |  |  |  | $ 0.4308 |
Series A-2 Preferred |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Number of preferred shares in exchange |  | (1,405,332) |  | (1,405,332) |
Preferred stock exchange including deemed dividend |  | $ (4,764) |  | $ 4,764 |
Convertible preferred stock dividends per share |  |  |  | $ 0.1656 |
Convertible preferred stock, outstanding shares |  |  |  |  | 1,873,777
Series A-1 Preferred |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Convertible preferred stock, issued shares |  |  | 4,553,452 |  |
Convertible preferred stock dividends per share |  |  |  | $ 0.1656 |
Convertible preferred stock, outstanding shares |  |  |  |  | 7,372,719
Convertible Preferred Stock |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |
Convertible preferred stock, issued shares |  |  |  | 0 | 12,393,047
Convertible preferred stock, authorized shares |  |  |  | 0 | 12,393,497
Preferred stock exchange including deemed dividend |  |  |  | $ (5,326) |
Convertible preferred stock, outstanding shares |  |  |  | 0 | 12,393,047

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- Definition Convertible preferred stock convert into voting common stock. + References No definition available. + Details
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- Definition Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 Reference 4: 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(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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 6: 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 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: 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(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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