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Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Redeemable Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Apr. 26, 2017 |  |  |  |  |
Balance, shares at Apr. 26, 2017 |  |  |  |  |
Temporary equity balance at Apr. 26, 2017 |  |  |  |  |
Temporary equity balance, shares at Apr. 26, 2017 |  |  |  |  |
Common stock issued to founder |  | $ 4 |  |  | 4
Common stock issued to founder, shares |  | 3,500,000 |  |  |
Stock-based compensation |  | $ 2 | 1,759 |  | 1,761
Stock-based compensation, shares |  | 2,500,000 |  |  |
Issuance of Series A redeemable convertible preferred stock, net of issuance costs | $ 17,521 |  |  |  |
Issuance of Series A redeemable convertible preferred stock, net of issuance costs, shares | 6,685,082 |  |  |  |
Accrued dividends on redeemable convertible preferred stock | $ 643 |  |  | (643) | (643)
Accrued dividends on redeemable convertible preferred stock, shares |  |  |  |  |
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs | $ 840 |  |  | (840) | (840)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs, shares |  |  |  |  |
Net loss |  |  |  | (7,156) | (7,156)
Balance at Dec. 31, 2017 |  | $ 6 | 1,759 | (8,639) | $ (6,874)
Balance, shares at Dec. 31, 2017 |  | 6,000,000 |  |  |
Temporary equity balance at Dec. 31, 2017 | $ 19,004 |  |  |  |
Temporary equity balance, shares at Dec. 31, 2017 | 6,685,082 |  |  |  | 6,685,082
Stock-based compensation |  |  | 1,850 |  | $ 1,850
Stock-based compensation, shares |  | 218,980 |  |  |
Accrued dividends on redeemable convertible preferred stock | $ 1,048 |  |  | (1,048) | (1,048)
Accrued dividends on redeemable convertible preferred stock, shares |  |  |  |  |
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs | $ 1,694 |  |  | (1,694) | (1,694)
Deemed dividends for accretion of redeemable convertible preferred stock issuance costs, shares |  |  |  |  |
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount |  | $ 4 | 21,956 |  | 21,960
Issuance of common stock in connection with initial public offering, including underwriter's over-allotment, net of offering costs and underwriter's discount, shares |  | 4,140,000 |  |  |
Conversion of redeemable convertible preferred stock (including accrued dividends) to common stock in connection with initial public offering | $ (21,746) | $ 8 | 21,738 |  | 21,746
Conversion of redeemable convertible preferred stock (including accrued dividends) to common stock in connection with initial public offering, shares | (6,685,082) | 7,248,948 |  |  |
Reclassification of common stock warrants from liability to additional paid-in-capital |  |  | 3,103 |  | 3,103
Beneficial conversion feature on redeemable convertible preferred stock |  |  | 21,747 | (21,747) |
Net loss |  |  |  | (12,740) | (12,740)
Balance at Dec. 31, 2018 |  | $ 18 | $ 72,153 | $ (45,868) | $ 26,303
Balance, shares at Dec. 31, 2018 |  | 17,607,928 |  |  |
Temporary equity balance at Dec. 31, 2018 |  |  |  |  |
Temporary equity balance, shares at Dec. 31, 2018 |  |  |  |  |

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