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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Restricted stock units | Initial Public Offering | At-the-Market Offering | Common Stock | Common Stock Restricted stock units | Common Stock Initial Public Offering | Common Stock At-the-Market Offering | Additional Pain In Capital | Additional Pain In Capital Restricted stock units | Additional Pain In Capital Initial Public Offering | Additional Pain In Capital At-the-Market Offering | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Series A Redeemable Convertible Preferred Stock | Series B Redeemable Convertible Preferred Stock
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Balance at Dec. 31, 2016 | $ 0 |  |  |  | $ 1 |  |  |  | $ 0 |  |  |  | $ (1) | $ 0 |  |
Balance, shares at Dec. 31, 2016 |  |  |  |  | 2,082,860 |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares to PureTech, shares |  |  |  |  | 1,886,363 |  |  |  |  |  |  |  |  |  |  |
Issuance of redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,674 | $ 39,946
Issuance of redeemable convertible preferred stock, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,527,951 | 4,792,716
Issuance of redeemable convertible preferred stock, adjustments to additional paid in capital | 1,379 |  |  |  |  |  |  |  | 1,379 |  |  |  |  |  |  |
Vesting of restricted shares, shares |  |  |  |  | 593,417 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 470 |  |  |  |  |  |  |  | 470 |  |  |  |  |  |  |
Net loss | (33,778) |  |  |  |  |  |  |  |  |  |  |  | (33,778) |  |  |
Balance at Dec. 31, 2017 | (31,929) |  |  |  | $ 1 |  |  |  | 1,849 |  |  |  | (33,779) |  |  |
Balance, temporary equity, shares at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,527,951 | 4,792,716
Balance, temporary equity at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,674 | $ 39,946
Balance, shares at Dec. 31, 2017 |  |  |  |  | 4,562,640 |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock upon the closing of initial public offering | 81,620 |  |  |  | $ 1 |  |  |  | 81,619 |  |  |  |  |  | $ (41,674) | $ (39,946)
Conversion of convertible preferred stock into common stock upon the closing of initial public offering, Shares |  |  |  |  | 15,870,559 |  |  |  |  |  |  |  |  |  | (15,527,951) | (4,792,716)
Issuance of common stock |  |  | $ 89,370 |  |  |  | $ 1 |  |  |  | $ 89,369 |  |  |  |  |
Issuance of common stock, Shares |  |  |  |  |  |  | 6,516,667 |  |  |  |  |  |  |  |  |
Vesting of restricted shares | 865 |  |  |  |  |  |  |  | 865 |  |  |  |  |  |  |
Vesting of restricted shares, shares |  |  |  |  | 1,097,449 |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 5 |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |
Exercise of stock options, Shares |  |  |  |  | 7,029 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 1,928 |  |  |  |  |  |  |  | 1,928 |  |  |  |  |  |  |
Net loss | (37,614) |  |  |  |  |  |  |  |  |  |  |  | (37,614) |  |  |
Net unrealized gains (losses) on marketable securities | (41) |  |  |  |  |  |  |  |  |  |  |  |  | (41) |  |
Balance at Dec. 31, 2018 | 104,204 |  |  |  | $ 3 |  |  |  | 175,635 |  |  |  | (71,393) | (41) |  |
Balance, temporary equity, shares at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Balance, temporary equity at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
Balance, shares at Dec. 31, 2018 |  |  |  |  | 28,054,344 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  | 46,585 |  |  |  | $ 1 |  |  |  | 46,584 |  |  |  |  |
Issuance of common stock, Shares |  |  |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |  |
Vesting of restricted shares | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Vesting of restricted shares, shares |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 662 |  |  |  |  |  |  |  | 662 |  |  |  |  |  |  |
Net loss | (11,069) |  |  |  |  |  |  |  |  |  |  |  | (11,069) |  |  |
Net unrealized gains (losses) on marketable securities | 73 |  |  |  |  |  |  |  |  |  |  |  |  | 73 |  |
Balance at Mar. 31, 2019 | 140,456 |  |  |  | $ 4 |  |  |  | 222,882 |  |  |  | (82,462) | 32 |  |
Balance, shares at Mar. 31, 2019 |  |  |  |  | 35,254,844 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | 104,204 |  |  |  | $ 3 |  |  |  | 175,635 |  |  |  | (71,393) | (41) |  |
Balance, temporary equity, shares at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Balance, temporary equity at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
Balance, shares at Dec. 31, 2018 |  |  |  |  | 28,054,344 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for taxes |  | $ (20) |  |  |  |  |  |  |  | $ (20) |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for taxes, shares |  |  |  |  |  | 6,625 |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  | $ 49,747 | $ 6,716 |  |  | $ 1 |  |  |  | $ 49,746 | $ 6,716 |  |  |  |
Issuance of common stock, Shares |  |  |  |  |  |  | 7,687,934 | 687,800 |  |  |  |  |  |  |  |
Vesting of restricted shares | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Vesting of restricted shares, shares |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 6 |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Exercise of stock options, Shares |  |  |  |  | 7,029 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 3,693 |  |  |  |  |  |  |  | 3,693 |  |  |  |  |  |  |
Net loss | (82,739) |  |  |  |  |  |  |  |  |  |  |  | (82,739) |  |  |
Net unrealized gains (losses) on marketable securities | 90 |  |  |  |  |  |  |  |  |  |  |  |  | 90 |  |
Balance at Dec. 31, 2019 | 81,698 |  |  |  | $ 4 |  |  |  | 235,777 |  |  |  | (154,132) | 49 |  |
Balance, shares at Dec. 31, 2019 |  |  |  |  | 36,444,732 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for taxes |  | $ (1) |  |  |  |  |  |  |  | $ (1) |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for taxes, shares |  |  |  |  |  | 1,019 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 975 |  |  |  |  |  |  |  | 975 |  |  |  |  |  |  |
Net loss | (7,038) |  |  |  |  |  |  |  |  |  |  |  | (7,038) |  |  |
Net unrealized gains (losses) on marketable securities | (17) |  |  |  |  |  |  |  |  |  |  |  |  | (17) |  |
Balance at Mar. 31, 2020 | $ 75,617 |  |  |  | $ 4 |  |  |  | $ 236,751 |  |  |  | $ (161,170) | $ 32 |  |
Balance, shares at Mar. 31, 2020 |  |  |  |  | 36,445,751 |  |  |  |  |  |  |  |  |  |  |

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- Definition Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 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 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 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(31)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. 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. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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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- Definition Value of new stock classified as temporary equity issued during the period. + References No definition available. + Details
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