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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Preferred Stock 8.625% Series A Cumulative, Perpetual Preferred Stock | Preferred Stock 8.375% Series B Cumulative, Perpetual Preferred Stock | Preferred Stock Convertible preferred stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2021 | $ 49 |  |  | $ 85 | $ 1,307,030 | $ (1,165,288) | $ 141,876
Balance at beginning of period (in shares) at Dec. 31, 2021 | 984,000 | 2,000 | 5,000 | 11,315,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options |  |  |  | $ 1 | 632 |  | 633
Exercise of stock options (in shares) |  |  |  | 91,000 |  |  |
Issuance of common stock related to 401(k) contribution |  |  |  |  | 85 |  | 85
Issuance of common stock related to 401(k) contribution (in shares) |  |  |  | 4,000 |  |  |
Stock-based compensation expense |  |  |  |  | 978 |  | 978
Preferred stock dividends |  |  |  |  | (1,368) |  | (1,368)
Net loss and comprehensive loss |  |  |  |  |  | (2,280) | (2,280)
Balance at end of period at Mar. 31, 2022 | $ 49 |  |  | $ 86 | 1,307,357 | (1,167,568) | 139,924
Balance at end of period (in shares) at Mar. 31, 2022 | 984,000 | 2,000 | 5,000 | 11,410,000 |  |  |
Balance at beginning of period at Dec. 31, 2021 | $ 49 |  |  | $ 85 | 1,307,030 | (1,165,288) | 141,876
Balance at beginning of period (in shares) at Dec. 31, 2021 | 984,000 | 2,000 | 5,000 | 11,315,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net loss and comprehensive loss |  |  |  |  |  |  | (11,128)
Balance at end of period at Sep. 30, 2022 | $ 49 |  |  | $ 86 | 1,306,606 | (1,176,416) | 130,325
Balance at end of period (in shares) at Sep. 30, 2022 | 984,000 | 2,000 | 5,000 | 11,451,000 |  |  |
Balance at beginning of period at Mar. 31, 2022 | $ 49 |  |  | $ 86 | 1,307,357 | (1,167,568) | 139,924
Balance at beginning of period (in shares) at Mar. 31, 2022 | 984,000 | 2,000 | 5,000 | 11,410,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options |  |  |  |  | 189 |  | 189
Exercise of stock options (in shares) |  |  |  | 11,000 |  |  |
Issuance of common stock related to ESPP |  |  |  |  | 45 |  | 45
Issuance of common stock related to ESPP (in shares) |  |  |  | 3,000 |  |  |
Stock-based compensation expense |  |  |  |  | 836 |  | 836
Preferred stock dividends |  |  |  |  | (1,368) |  | (1,368)
Net loss and comprehensive loss |  |  |  |  |  | (4,670) | (4,670)
Balance at end of period at Jun. 30, 2022 | $ 49 |  |  | $ 86 | 1,307,059 | (1,172,238) | 134,956
Balance at end of period (in shares) at Jun. 30, 2022 | 984,000 | 2,000 | 5,000 | 11,424,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options |  |  |  |  | 109 |  | 109
Exercise of stock options (in shares) |  |  |  | 27,000 |  |  |
Stock-based compensation expense |  |  |  |  | 806 |  | 806
Preferred stock dividends |  |  |  |  | (1,368) |  | (1,368)
Net loss and comprehensive loss |  |  |  |  |  | (4,178) | (4,178)
Balance at end of period at Sep. 30, 2022 | $ 49 |  |  | $ 86 | 1,306,606 | (1,176,416) | 130,325
Balance at end of period (in shares) at Sep. 30, 2022 | 984,000 | 2,000 | 5,000 | 11,451,000 |  |  |
Balance at beginning of period at Dec. 31, 2022 | $ 49 |  |  | $ 86 | 1,306,271 | (1,182,392) | 124,014
Balance at beginning of period (in shares) at Dec. 31, 2022 | 984,000 | 2,000 | 5,000 | 11,454,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Issuance of common stock related to 401(k) contribution |  |  |  |  | 123 |  | 123
Issuance of common stock related to 401(k) contribution (in shares) |  |  |  | 7,000 |  |  |
Stock-based compensation expense |  |  |  |  | 1,570 |  | 1,570
Preferred stock dividends |  |  |  |  | (1,368) |  | (1,368)
Net loss and comprehensive loss |  |  |  |  |  | (9,813) | (9,813)
Balance at end of period at Mar. 31, 2023 | $ 49 |  |  | $ 86 | 1,306,596 | (1,192,205) | 114,526
Balance at end of period (in shares) at Mar. 31, 2023 | 984,000 | 2,000 | 5,000 | 11,461,000 |  |  |
Balance at beginning of period at Dec. 31, 2022 | $ 49 |  |  | $ 86 | 1,306,271 | (1,182,392) | $ 124,014
Balance at beginning of period (in shares) at Dec. 31, 2022 | 984,000 | 2,000 | 5,000 | 11,454,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  |  |  |  |  | 8,473
Net loss and comprehensive loss |  |  |  |  |  |  | $ (20,722)
Balance at end of period at Sep. 30, 2023 | $ 49 |  |  | $ 86 | 1,308,943 | (1,203,114) | 105,964
Balance at end of period (in shares) at Sep. 30, 2023 | 984,000 | 2,000 | 5,000 | 11,472,000 |  |  |
Balance at beginning of period at Mar. 31, 2023 | $ 49 |  |  | $ 86 | 1,306,596 | (1,192,205) | 114,526
Balance at beginning of period (in shares) at Mar. 31, 2023 | 984,000 | 2,000 | 5,000 | 11,461,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Exercise of stock options |  |  |  |  | 153 |  | 153
Exercise of stock options (in shares) |  |  |  | 8,000 |  |  |
Issuance of common stock related to ESPP |  |  |  |  | 50 |  | 50
Issuance of common stock related to ESPP (in shares) |  |  |  | 3,000 |  |  |
Stock-based compensation expense |  |  |  |  | 2,163 |  | 2,163
Preferred stock dividends |  |  |  |  | (1,368) |  | (1,368)
Net loss and comprehensive loss |  |  |  |  |  | (5,400) | (5,400)
Balance at end of period at Jun. 30, 2023 | $ 49 |  |  | $ 86 | 1,307,594 | (1,197,605) | 110,124
Balance at end of period (in shares) at Jun. 30, 2023 | 984,000 | 2,000 | 5,000 | 11,472,000 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | 2,717 |  | 2,717
Preferred stock dividends |  |  |  |  | (1,368) |  | (1,368)
Net loss and comprehensive loss |  |  |  |  |  | (5,509) | (5,509)
Balance at end of period at Sep. 30, 2023 | $ 49 |  |  | $ 86 | $ 1,308,943 | $ (1,203,114) | $ 105,964
Balance at end of period (in shares) at Sep. 30, 2023 | 984,000 | 2,000 | 5,000 | 11,472,000 |  |  |

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