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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK, REDEEMABLE COMMON STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | Redeemable Common Stock | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2019 |  |  | 16,128,862 |  |  |
Beginning balance at Dec. 31, 2019 | $ 129,220 |  | $ 16 | $ 261,367 | $ (119) | $ (132,044)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, shares |  |  | 13,006 |  |  |
Exercise of stock options | 96 |  |  | 96 |  |
Stock-based compensation expense | 613 |  |  | 613 |  |
Net loss | (11,138) |  |  |  |  | (11,138)
Ending balance, shares at Mar. 31, 2020 |  |  | 16,141,868 |  |  |
Ending balance at Mar. 31, 2020 | 118,791 |  | $ 16 | 262,076 | (119) | (143,182)
Beginning balance, shares at Dec. 31, 2019 |  |  | 16,128,862 |  |  |
Beginning balance at Dec. 31, 2019 | 129,220 |  | $ 16 | 261,367 | (119) | (132,044)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss | $ (43,731) |  |  |  |  |
Ending balance, shares at Sep. 30, 2020 | 16,286,645 |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 89,708 |  | $ 16 | 265,586 | (119) | (175,775)
Beginning balance, shares at Mar. 31, 2020 |  |  | 16,141,868 |  |  |
Beginning balance at Mar. 31, 2020 | 118,791 |  | $ 16 | 262,076 | (119) | (143,182)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of shares under employee stock purchase plan, shares |  |  | 10,057 |  |  |
Issuance of shares under employee stock purchase plan | 76 |  |  | 76 |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations, shares |  |  | 23,822 |  |  |
Exercise of stock options, shares |  |  | 407 |  |  |
Exercise of stock options | 2 |  |  | 2 |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations | (14) |  | $ (14) |  |  |
Stock-based compensation expense | 1,173 |  |  | 1,173 |  |
Net loss | $ (15,144) |  |  |  |  | (15,144)
Ending balance, shares at Jun. 30, 2020 | 16,176,154 |  |  |  |  |
Ending balance at Jun. 30, 2020 | $ 104,884 |  | $ 16 | 263,313 | (119) | (158,326)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations, shares |  |  | 106,215 |  |  |
Exercise of stock options, shares |  |  | 4,276 |  |  |
Exercise of stock options | 29 |  |  | 29 |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations | 0 |  |  |  |  |
Stock-based compensation expense | 2,244 |  |  | 2,244 |  |
Net loss | $ (17,449) |  |  |  |  | (17,449)
Ending balance, shares at Sep. 30, 2020 | 16,286,645 |  |  |  |  |
Ending balance at Sep. 30, 2020 | $ 89,708 |  | $ 16 | 265,586 | (119) | (175,775)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Redeemable Common Shares, Value |  | $ 0 |  |  |  |
Redeemable common shares, beginning balance, shares at Dec. 31, 2020 |  | 0 |  |  |  |
Convertible preferred shares, ending balance, shares at Mar. 31, 2021 |  | 229,885 |  |  |  |
Beginning balance, shares at Dec. 31, 2020 |  |  | 16,305,731 |  |  |
Beginning balance at Dec. 31, 2020 | 72,799 |  | $ 16 | 267,077 | (119) | (194,175)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 229,885 | 6,041,951 |  |  |
Stock Issued During Period, Value, New Issues | 49,640 | $ 1,875 | $ 7 | 49,633 |  |
Stock Issued During Period Shares Warrants Exercised |  |  | 1,072,887 |  |  |
Stock Issued During Period Value Warrants Exercised | 1 |  | $ 1 |  |  |
Exercise of stock options, shares |  |  | 5,860 |  |  |
Exercise of stock options | 40 |  |  | 40 |  |
Stock-based compensation expense | 1,258 |  |  | 1,258 |  |
Net loss | (18,676) |  |  |  |  | (18,676)
Ending balance, shares at Mar. 31, 2021 |  |  | 23,426,429 |  |  |
Ending balance at Mar. 31, 2021 | 105,062 |  | $ 24 | 318,008 | (119) | (212,851)
Redeemable common shares, beginning balance, shares at Dec. 31, 2020 |  | 0 |  |  |  |
Convertible preferred shares, ending balance, shares at Sep. 30, 2021 |  | 0 |  |  |  |
Beginning balance, shares at Dec. 31, 2020 |  |  | 16,305,731 |  |  |
Beginning balance at Dec. 31, 2020 | $ 72,799 |  | $ 16 | 267,077 | (119) | (194,175)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, shares | 5,860 |  |  |  |  |
Net loss | $ (58,489) |  |  |  |  |
Ending balance, shares at Sep. 30, 2021 |  |  | 24,708,727 |  |  |
Ending balance at Sep. 30, 2021 | 68,679 |  | $ 25 | 321,437 | (119) | (252,664)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Redeemable Common Shares, Value |  | $ 1,875 |  |  |  |
Redeemable common shares, beginning balance, shares at Mar. 31, 2021 |  | 229,885 |  |  |  |
Convertible preferred shares, ending balance, shares at Jun. 30, 2021 |  | 229,885 |  |  |  |
Beginning balance, shares at Mar. 31, 2021 |  |  | 23,426,429 |  |  |
Beginning balance at Mar. 31, 2021 | 105,062 |  | $ 24 | 318,008 | (119) | (212,851)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of shares under employee stock purchase plan, shares |  |  | 20,232 |  |  |
Issuance of shares under employee stock purchase plan | 116 |  |  | 116 |  |
Stock Issued During Period Shares Warrants Exercised |  |  | 1,056,881 |  |  |
Stock Issued During Period Value Warrants Exercised | 1 |  | $ 1 |  |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations, shares |  |  | 81,316 |  |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations | 0 |  |  |  |  |
Stock-based compensation expense | 1,797 |  |  | 1,797 |  |
Net loss | (19,638) |  |  |  |  |
Ending balance, shares at Jun. 30, 2021 |  |  | 24,584,858 |  |  |
Ending balance at Jun. 30, 2021 | $ 87,338 |  | $ 25 | 319,921 | (119) | (232,489)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Redeemable Common Shares, Value |  | $ 1,875 |  |  |  |
Convertible preferred shares, ending balance, shares at Sep. 30, 2021 |  | 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 6,271,836 |  |  |  |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations, shares |  |  | 123,869 |  |  |
Vesting of restricted stock units, less shares withheld and retired to satisfy tax obligations | $ 0 |  |  |  |  |
Stock-based compensation expense | $ 1,516 |  |  | 1,516 |  |
Repurchase and retirement of redeemable common stock | 229,885 |  |  |  |  |
Repurchase and retirement of redeemable common stock | $ 0 | $ 1,875 |  |  |  |
Net loss | (20,175) |  |  |  |  |
Ending balance, shares at Sep. 30, 2021 |  |  | 24,708,727 |  |  |
Ending balance at Sep. 30, 2021 | $ 68,679 |  | $ 25 | $ 321,437 | $ (119) | $ (252,664)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Redeemable Common Shares, Value |  | $ 0 |  |  |  |

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