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Condensed Statements of Convertible Preferred Stock, Common Stock and Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands | Total | Convertible Preferred Stock [Member] | Common Stock [Member] | Common Stock [Member] License Agreement [Member] | Additional Paid In Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | --- | ---
Temporary equity shares beginning at Dec. 31, 2019 |  | 2,713,980 |  |  |  |
Temporary equity amount beginning at Dec. 31, 2019 |  | $ 8,896 |  |  |  |
Shares beginning at Dec. 31, 2019 |  |  | 3,235,671 |  |  |
Balance beginning at Dec. 31, 2019 | $ (9,242) |  | $ 1 |  | $ 238 | $ (9,481)
Stock issued during period shares new issues, amount | 200 | $ 5,480 |  |  | 200 |
Stock issued during period shares new issues, shares |  | 1,533,947 | 182,500 | 44,011 |  |
Stock-based compensation expense | 18 |  |  |  | 18 |
Net loss | (1,691) |  |  |  |  | (1,691)
Temporary equity shares ending at Mar. 31, 2020 |  | 4,247,927 |  |  |  |
Temporary equity amount ending at Mar. 31, 2020 |  | $ 14,376 |  |  |  |
Shares ending at Mar. 31, 2020 |  |  | 3,462,182 |  |  |
Balance ending at Mar. 31, 2020 | (10,715) |  | $ 1 |  | 456 | (11,172)
Temporary equity shares beginning at Dec. 31, 2019 |  | 2,713,980 |  |  |  |
Temporary equity amount beginning at Dec. 31, 2019 |  | $ 8,896 |  |  |  |
Shares beginning at Dec. 31, 2019 |  |  | 3,235,671 |  |  |
Balance beginning at Dec. 31, 2019 | (9,242) |  | $ 1 |  | 238 | (9,481)
Stock-based compensation expense | 38 |  |  |  |  |
Net loss | (4,565) |  |  |  |  |
Temporary equity shares ending at Jun. 30, 2020 |  | 4,247,927 |  |  |  |
Temporary equity amount ending at Jun. 30, 2020 |  | $ 14,376 |  |  |  |
Shares ending at Jun. 30, 2020 |  |  | 3,462,182 |  |  |
Balance ending at Jun. 30, 2020 | (13,569) |  | $ 1 |  | 476 | (14,046)
Temporary equity shares beginning at Mar. 31, 2020 |  | 4,247,927 |  |  |  |
Temporary equity amount beginning at Mar. 31, 2020 |  | $ 14,376 |  |  |  |
Shares beginning at Mar. 31, 2020 |  |  | 3,462,182 |  |  |
Balance beginning at Mar. 31, 2020 | (10,715) |  | $ 1 |  | 456 | (11,172)
Stock-based compensation expense | 20 |  |  |  | 20 |
Net loss | (2,874) |  |  |  |  | (2,874)
Temporary equity shares ending at Jun. 30, 2020 |  | 4,247,927 |  |  |  |
Temporary equity amount ending at Jun. 30, 2020 |  | $ 14,376 |  |  |  |
Shares ending at Jun. 30, 2020 |  |  | 3,462,182 |  |  |
Balance ending at Jun. 30, 2020 | $ (13,569) |  | $ 1 |  | 476 | (14,046)
Temporary equity shares beginning at Dec. 31, 2020 | 9,993,727 | 9,993,727 |  |  |  |
Temporary equity amount beginning at Dec. 31, 2020 | $ 34,900 | $ 34,900 |  |  |  |
Shares beginning at Dec. 31, 2020 |  |  | 3,764,488 |  |  |
Balance beginning at Dec. 31, 2020 | (16,579) |  | $ 1 |  | 1,458 | (18,038)
Stock-based compensation expense | 361 |  |  |  | 361 |
Net loss | (2,363) |  |  |  |  | (2,363)
Temporary equity shares ending at Mar. 31, 2021 |  | 9,993,727 |  |  |  |
Temporary equity amount ending at Mar. 31, 2021 |  | $ 34,900 |  |  |  |
Shares ending at Mar. 31, 2021 |  |  | 3,764,488 |  |  |
Balance ending at Mar. 31, 2021 | $ (18,581) |  | $ 1 |  | 1,819 | (20,401)
Temporary equity shares beginning at Dec. 31, 2020 | 9,993,727 | 9,993,727 |  |  |  |
Temporary equity amount beginning at Dec. 31, 2020 | $ 34,900 | $ 34,900 |  |  |  |
Shares beginning at Dec. 31, 2020 |  |  | 3,764,488 |  |  |
Balance beginning at Dec. 31, 2020 | (16,579) |  | $ 1 |  | 1,458 | (18,038)
Stock-based compensation expense | 753 |  |  |  |  |
Net loss | $ (5,413) |  |  |  |  |
Temporary equity shares ending at Jun. 30, 2021 | 9,993,727 | 9,993,727 |  |  |  |
Temporary equity amount ending at Jun. 30, 2021 | $ 34,900 | $ 34,900 |  |  |  |
Shares ending at Jun. 30, 2021 |  |  | 3,764,488 |  |  |
Balance ending at Jun. 30, 2021 | (21,239) |  | $ 1 |  | 2,211 | (23,451)
Temporary equity shares beginning at Mar. 31, 2021 |  | 9,993,727 |  |  |  |
Temporary equity amount beginning at Mar. 31, 2021 |  | $ 34,900 |  |  |  |
Shares beginning at Mar. 31, 2021 |  |  | 3,764,488 |  |  |
Balance beginning at Mar. 31, 2021 | (18,581) |  | $ 1 |  | 1,819 | (20,401)
Stock-based compensation expense | 392 |  |  |  | 392 |
Net loss | $ (3,050) |  |  |  |  | (3,050)
Temporary equity shares ending at Jun. 30, 2021 | 9,993,727 | 9,993,727 |  |  |  |
Temporary equity amount ending at Jun. 30, 2021 | $ 34,900 | $ 34,900 |  |  |  |
Shares ending at Jun. 30, 2021 |  |  | 3,764,488 |  |  |
Balance ending at Jun. 30, 2021 | $ (21,239) |  | $ 1 |  | $ 2,211 | $ (23,451)

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