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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Comprehensive Deficit
--- | --- | --- | --- | ---
BALANCE, at beginning of period (in shares) at Dec. 31, 2021 |  | 54,259,000 |  |
BALANCE, at beginning of period at Dec. 31, 2021 | $ 100,560 | $ 54 | $ 352,779 | $ (252,273)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Non-cash compensation recognized on stock options and employee stock purchase plan ("ESPP") | 86 |  | 86 |
Restricted stock grants, net of cancellations (in shares) |  | 1,187,000 |  |
Restricted stock grants, net of cancellations | 4,862 | $ 1 | 4,861 |
Cancellation of shares for payment of withholding tax (in shares) |  | (406,000) |  |
Cancellation of shares for payment of withholding tax | (1,218) |  | (1,218) |
ESPP (in shares) |  | 17,000 |  |
ESPP shares issued | 40 |  | 40 |
Exercise of stock options (in shares) |  | 9,000 |  |
Exercise of stock options | 19 |  | 19 |
Common shares issued in stock offering, net offering costs (in shares) |  | 1,132,000 |  |
Common shares issued in stock offering, net of offering costs | 1,309 | $ 1 | 1,308 |
Net loss | $ (29,279) |  |  | (29,279)
BALANCE, at end of period (in shares) at Dec. 31, 2022 | 56,197,910 | 56,198,000 |  |
BALANCE, at end of period at Dec. 31, 2022 | $ 76,379 | $ 56 | 357,875 | (281,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Non-cash compensation recognized on stock options and employee stock purchase plan ("ESPP") | 30 |  | 30 |
Restricted stock grants, net of cancellations (in shares) |  | 1,819,000 |  |
Restricted stock grants, net of cancellations | 4,806 | $ 2 | 4,804 |
Cancellation of shares for payment of withholding tax (in shares) |  | (374,000) |  |
Cancellation of shares for payment of withholding tax | (496) |  | (496) |
ESPP (in shares) |  | 15,000 |  |
ESPP shares issued | $ 15 |  | 15 |
Exercise of stock options (in shares) | 0 |  |  |
Common shares issued in settlement and prepayment of notes payable (in shares) |  | 17,126,000 |  |
Common shares issued in settlement and prepayment of notes payable | $ 19,052 | $ 17 | 19,035 |
Net loss | $ (24,396) |  |  | (24,396)
BALANCE, at end of period (in shares) at Dec. 31, 2023 | 74,783,834 | 74,784,000 |  |
BALANCE, at end of period at Dec. 31, 2023 | $ 75,390 | $ 75 | $ 381,263 | $ (305,948)

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