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Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 115,593 | $ 1 | $ 9,859 |  | $ (108,452) | $ (98,592)
Beginning balance, shares at Dec. 31, 2019 | 26,425,664 | 5,270,889 |  |  |  |
Issuance of common stock upon exercise of stock options |  |  | 185 |  |  | 185
Issuance of common stock upon exercise of stock options, shares |  | 40,263 |  |  |  |
Vesting of restricted common stock, shares |  | 517,524 |  |  |  |
Issuance of Series C convertible preferred stock, net of issuance costs of $2,640, shares | 19,936,296 |  |  |  |  |
Issuance of Series C convertible preferred stock, net of issuance costs of $2,640 | $ 108,832 |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock | $ (224,425) |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock, shares | (46,361,960) |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering |  | $ 3 | 224,422 |  |  | 224,425
Conversion of convertible preferred stock into common stock upon initial public offering, shares |  | 27,094,085 |  |  |  |
Issuance of common stock upon initial public offering, net of issuance costs |  | $ 1 | 210,714 |  |  | 210,715
Issuance of common stock upon initial public offering, net of issuance costs, shares |  | 12,105,263 |  |  |  |
Stock-based compensation expense |  |  | 2,872 |  |  | 2,872
Unrealized gains (losses) on marketable securities |  |  |  | $ (4) |  | (4)
Net loss |  |  |  |  | (35,448) | (35,448)
Ending balance at Jun. 30, 2020 |  | $ 5 | 448,052 | (4) | (143,900) | 304,153
Ending balance, shares at Jun. 30, 2020 |  | 45,028,024 |  |  |  |
Beginning balance at Mar. 31, 2020 | $ 224,425 | $ 1 | 11,517 |  | (126,169) | (114,651)
Beginning balance, shares at Mar. 31, 2020 | 46,361,960 | 5,570,652 |  |  |  |
Issuance of common stock upon exercise of stock options |  |  | 31 |  |  | 31
Issuance of common stock upon exercise of stock options, shares |  | 5,434 |  |  |  |
Vesting of restricted common stock, shares |  | 252,590 |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock | $ (224,425) |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering, convertible preferred stock, shares | (46,361,960) |  |  |  |  |
Conversion of convertible preferred stock into common stock upon initial public offering |  | $ 3 | 224,422 |  |  | 224,425
Conversion of convertible preferred stock into common stock upon initial public offering, shares |  | 27,094,085 |  |  |  |
Issuance of common stock upon initial public offering, net of issuance costs |  | $ 1 | 210,714 |  |  | 210,715
Issuance of common stock upon initial public offering, net of issuance costs, shares |  | 12,105,263 |  |  |  |
Stock-based compensation expense |  |  | 1,368 |  |  | 1,368
Unrealized gains (losses) on marketable securities |  |  |  | (4) |  | (4)
Net loss |  |  |  |  | (17,731) | (17,731)
Ending balance at Jun. 30, 2020 |  | $ 5 | 448,052 | (4) | (143,900) | 304,153
Ending balance, shares at Jun. 30, 2020 |  | 45,028,024 |  |  |  |
Beginning balance at Dec. 31, 2020 |  | $ 5 | 456,974 | 9 | (188,975) | 268,013
Beginning balance, shares at Dec. 31, 2020 |  | 46,291,877 |  |  |  |
Issuance of common stock upon exercise of stock options |  |  | 2,250 |  |  | 2,250
Issuance of common stock upon exercise of stock options, shares |  | 543,520 |  |  |  |
Vesting of restricted common stock, shares |  | 380,605 |  |  |  |
Issuance of common stock upon initial public offering, net of issuance costs |  | $ 1 | 211,285 |  |  | 211,286
Issuance of common stock upon initial public offering, net of issuance costs, shares |  | 9,200,000 |  |  |  |
Issuance of common stock under other equity plans |  |  | 355 |  |  | 355
Issuance of common stock under other equity plans, shares |  | 15,511 |  |  |  |
Stock-based compensation expense |  |  | 7,856 |  |  | 7,856
Unrealized gains (losses) on marketable securities |  |  |  | (5) |  | (5)
Net loss |  |  |  |  | (56,353) | (56,353)
Ending balance at Jun. 30, 2021 |  | $ 6 | 678,720 | 4 | (245,328) | 433,402
Ending balance, shares at Jun. 30, 2021 |  | 56,431,513 |  |  |  |
Beginning balance at Mar. 31, 2021 |  | $ 6 | 673,257 | 10 | (214,537) | 458,736
Beginning balance, shares at Mar. 31, 2021 |  | 56,094,529 |  |  |  |
Issuance of common stock upon exercise of stock options |  |  | 731 |  |  | 731
Issuance of common stock upon exercise of stock options, shares |  | 155,942 |  |  |  |
Vesting of restricted common stock, shares |  | 165,531 |  |  |  |
Issuance of common stock upon initial public offering, net of issuance costs |  |  | 355 |  |  | 355
Issuance of common stock upon initial public offering, net of issuance costs, shares |  | 15,511 |  |  |  |
Stock-based compensation expense |  |  | 4,377 |  |  | 4,377
Unrealized gains (losses) on marketable securities |  |  |  | (6) |  | (6)
Net loss |  |  |  |  | (30,791) | (30,791)
Ending balance at Jun. 30, 2021 |  | $ 6 | $ 678,720 | $ 4 | $ (245,328) | $ 433,402
Ending balance, shares at Jun. 30, 2021 |  | 56,431,513 |  |  |  |

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