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v3.22.2.2

Stockholders' Equity - Summary of Common Stock Shares Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Beginning balance | $ 38,927 | $ 25,924 | $ 41,258 | $ 22,758
Beginning balance (in shares) |  |  | 28,705,334 |
Net (loss) income | (13,345) | 1,658 | $ (18,796) | (3,018)
Stock-based compensation expense | 1,100 | 542 | 2,022 | 940
Common stock issued through employee stock purchase plan |  |  | 10 | 9
Common stock issued, net of expenses | 18,798 | 3,415 | 20,915 | 3,412
Common stock issued for vested restricted stock units | 0 | 15 | 0 | 0
Vested Loan Agreement warrants |  | 766 | 71 | 766
Ending balance | $ 45,480 | 32,320 | $ 45,480 | 32,320
Ending balance (in shares) | 32,596,403 |  | 32,596,403 |
April 2020 Notes |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Common stock issued for conversion of Notes |  |  |  | 7,453
Common Stock |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Beginning balance | $ 32 | $ 21 | $ 32 | $ 20
Beginning balance (in shares) | 29,221,158 | 20,625,637 | 28,705,334 | 19,663,698
Net (loss) income | $ 0 | $ 0 | $ 0 | $ 0
Stock-based compensation expense | 0 | 0 | 0 | 0
Common stock issued through employee stock purchase plan |  |  | $ 0 | $ 0
Common stock issued through employee stock purchase (in shares) |  |  | 3,120 | 2,184
Common stock issued, net of expenses | $ 4 | $ 5 | $ 4 | $ 5
Common stock issued, net of expenses (in shares) | 3,358,333 | 2,516,802 | 3,845,943 | 2,516,802
Common stock issued for vested restricted stock units | $ 0 | $ 0 | $ 0 | $ 0
Common stock issued for vested restricted stock units (in shares) | 16,912 | 5,113 | 42,006 | 5,788
Vested Loan Agreement warrants |  | $ 0 | $ 0 | $ 0
Ending balance | $ 36 | $ 26 | $ 36 | $ 26
Ending balance (in shares) | 32,596,403 | 23,147,552 | 32,596,403 | 23,147,552
Common Stock | April 2020 Notes |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Common stock issued for conversion of Notes |  |  |  | $ 1
Common stock issued for conversion of Notes (in shares) |  |  |  | 959,080
Additional Paid-in Capital |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Beginning balance | $ 403,825 | $ 357,192 | $ 400,705 | $ 349,351
Net (loss) income | 0 | 0 | 0 | 0
Stock-based compensation expense | 1,100 | 542 | 2,022 | 940
Common stock issued through employee stock purchase plan |  |  | 10 | 9
Common stock issued, net of expenses | 18,794 | 3,410 | 20,911 | 3,407
Common stock issued for vested restricted stock units | 0 | 15 | 0 | 0
Vested Loan Agreement warrants |  | 766 | 71 | 766
Ending balance | 423,719 | 361,925 | 423,719 | 361,925
Additional Paid-in Capital | April 2020 Notes |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Common stock issued for conversion of Notes |  |  |  | 7,452
Accumulated Deficit |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Beginning balance | (364,930) | (331,289) | (359,479) | (326,613)
Net (loss) income | (13,345) | 1,658 | (18,796) | (3,018)
Stock-based compensation expense | 0 | 0 | 0 | 0
Common stock issued through employee stock purchase plan |  |  | 0 | 0
Common stock issued, net of expenses | 0 | 0 | 0 | 0
Common stock issued for vested restricted stock units | 0 | 0 | 0 | 0
Vested Loan Agreement warrants |  | 0 | 0 | 0
Ending balance | $ (378,275) | $ (329,631) | $ (378,275) | (329,631)
Accumulated Deficit | April 2020 Notes |  |  |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |  |  |
Common stock issued for conversion of Notes |  |  |  | $ 0

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