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v3.21.1

Stockholders' Equity - Summary of Common Stock Shares Activity (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Common Stock Outstanding Roll Forward [Roll Forward] |  |
Beginning balance | $ 22,758 | $ 12,895
Beginning balance (in shares) | 19,663,698 |
Net loss | $ (4,676) | (7,002)
Stock-based compensation expense | 398 | 410
Common stock issued, net of expenses | 0 | 207
Common stock issued through employee stock purchase plan | 6 | 18
Common stock issued for vested restricted stock units | (15) | (73)
Ending balance | $ 25,924 | 6,455
Ending balance (in shares) | 20,625,637 |
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 | $ 20 | $ 10
Beginning balance (in shares) | 19,663,698 | 9,741,372
Net loss | $ 0 | $ 0
Stock-based compensation expense | 0 | 0
Common stock issued, net of expenses | $ 0 | $ 0
Common stock issued, net of expenses (in shares) | 0 | 28,527
Common stock issued through employee stock purchase plan | $ 0 | $ 0
Common stock issued through employee stock purchase plan (in shares) | 2,184 | 2,215
Common stock issued for vested restricted stock units | $ 0 | $ 0
Common stock issued for vested restricted stock units (in shares) | 675 | 15,490
Ending balance | $ 21 | $ 10
Ending balance (in shares) | 20,625,637 | 9,787,604
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 | $ 349,351 | $ 284,313
Net loss | 0 | 0
Stock-based compensation expense | 398 | 410
Common stock issued, net of expenses | 0 | 207
Common stock issued through employee stock purchase plan | 6 | 18
Common stock issued for vested restricted stock units | (15) | (73)
Ending balance | 357,192 | 284,875
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 | (326,613) | (271,428)
Net loss | (4,676) | (7,002)
Stock-based compensation expense | 0 | 0
Common stock issued, net of expenses | 0 | 0
Common stock issued through employee stock purchase plan | 0 | 0
Common stock issued for vested restricted stock units | 0 | 0
Ending balance | (331,289) | $ (278,430)
Accumulated Deficit | April 2020 Notes |  |
Common Stock Outstanding Roll Forward [Roll Forward] |  |
Common stock issued for conversion of Notes | $ 0 |

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