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Condensed Consolidated Statements of Changes in Stockholders' Deficit (Unaudited) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2019 |  | 33,562,885 |  |
Balance at Dec. 31, 2019 | $ (6,122) | $ 34 | $ 124,318 | $ (130,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Share-based compensation expense | 1,860 |  | 1,860 |
Vested restricted stock units (in shares) |  | 19,811 |  |
Vested restricted stock units | (37) |  | (37) |
Net loss | (16,530) |  |  | (16,530)
Balance (in shares) at Mar. 31, 2020 |  | 33,582,696 |  |
Balance at Mar. 31, 2020 | (20,829) | $ 34 | 126,141 | (147,004)
Balance (in shares) at Dec. 31, 2019 |  | 33,562,885 |  |
Balance at Dec. 31, 2019 | $ (6,122) | $ 34 | 124,318 | (130,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares issued under employee stock purchase plan (in shares) | 14,961 |  |  |
Net loss | $ (18,864) |  |  |
Balance (in shares) at Jun. 30, 2020 |  | 33,616,601 |  |
Balance at Jun. 30, 2020 | (21,388) | $ 34 | 127,916 | (149,338)
Balance (in shares) at Mar. 31, 2020 |  | 33,582,696 |  |
Balance at Mar. 31, 2020 | (20,829) | $ 34 | 126,141 | (147,004)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares issued under employee stock purchase plan (in shares) |  | 14,961 |  |
Shares issued under employee stock purchase plan | 73 |  | 73 |
Share-based compensation expense | 1,754 |  | 1,754 |
Vested restricted stock units (in shares) |  | 18,944 |  |
Vested restricted stock units | (52) |  | (52) |
Net loss | (2,334) |  |  | (2,334)
Balance (in shares) at Jun. 30, 2020 |  | 33,616,601 |  |
Balance at Jun. 30, 2020 | (21,388) | $ 34 | 127,916 | (149,338)
Balance (in shares) at Dec. 31, 2020 |  | 34,569,254 |  |
Balance at Dec. 31, 2020 | (48,497) | $ 35 | 137,725 | (186,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common Stock issued under public equity offering (in shares) |  | 1,672,104 |  |
Common Stock issued under public equity offering | 10,197 | $ 1 | 10,196 |
Costs of common stock issued under public equity offering | (306) |  | (306) |
Share-based compensation expense | 1,507 |  | 1,507 |
Other | (27) |  | (27) |
Net loss | (14,672) |  |  | (14,672)
Balance (in shares) at Mar. 31, 2021 |  | 36,241,358 |  |
Balance at Mar. 31, 2021 | (51,798) | $ 36 | 149,095 | (200,929)
Balance (in shares) at Dec. 31, 2020 |  | 34,569,254 |  |
Balance at Dec. 31, 2020 | $ (48,497) | $ 35 | 137,725 | (186,257)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares issued under employee stock purchase plan (in shares) | 19,270 |  |  |
Net loss | $ (27,039) |  |  |
Balance (in shares) at Jun. 30, 2021 |  | 38,568,242 |  |
Balance at Jun. 30, 2021 | (53,769) | $ 39 | 159,488 | (213,296)
Balance (in shares) at Mar. 31, 2021 |  | 36,241,358 |  |
Balance at Mar. 31, 2021 | (51,798) | $ 36 | 149,095 | (200,929)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common Stock issued under public equity offering (in shares) |  | 2,304,949 |  |
Common Stock issued under public equity offering | 9,241 | $ 3 | 9,238 |
Costs of common stock issued under public equity offering | (627) |  | (627) |
Shares issued under employee stock purchase plan (in shares) |  | 19,270 |  |
Shares issued under employee stock purchase plan | 76 |  | 76 |
Share-based compensation expense | 1,710 |  | 1,710 |
Vested restricted stock units (in shares) |  | 2,665 |  |
Vested restricted stock units | (4) |  | (4) |
Net loss | (12,367) |  |  | (12,367)
Balance (in shares) at Jun. 30, 2021 |  | 38,568,242 |  |
Balance at Jun. 30, 2021 | $ (53,769) | $ 39 | $ 159,488 | $ (213,296)

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