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Consolidated Statements of Stockholders' Deficit Parentheticals - shares | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Exercise of stock options, net (in shares) | 1,276,000 |  |
Employee stock purchase plan sales, net (in shares) | 338,000 | 260,000 | 321,000
Issuance of common stock, net (in shares) |  |  | 3,846,000
Warrants exercised (in shares) | 14,997,000 | 253,000 |
Shares withheld for taxes for vesting of restricted stock units (in shares) | 59,000 |  |
Common Stock |  |  |
Exercise of stock options, net (in shares) |  | 2,573,000 | 3,290,000
Employee stock purchase plan sales, net (in shares) | 338,000 | 260,000 | 321,000
Issuance of shares to directors in lieu of cash retainer (in shares) | 37,000 | 32,000 | 9,000
Common Stock | Restricted Stock Units (RSUs) |  |  |
Stock option awards vested (in shares) | 1,276,000 | 439,000 |

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