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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) | Preferred Stock [Member] Series A Convertible Redeemable Preferred Stock [Member] | Preferred Stock [Member] Series B Convertible Redeemable Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2021 |  |  | $ 1,472,000 | $ 696,563,000 | $ (655,640,000) | $ (27,000) | $ 42,368,000
Beginning balance, shares at Dec. 31, 2021 |  |  | 5,888,217 |  |  |  |
Stock-based compensation expense |  |  |  | 2,218,000 |  |  | 2,218,000
Issuance of common stock in connection with restricted share awards, net of cancellations |  |  | $ 3,000 | (3,000) |  |  |
Issuance of common stock in connection with restricted share awards, net of cancellations, shares |  |  | 745,000 |  |  |  |
Issuance of common stock, net of offering costs under open market sale agreement (ATM) |  |  | $ 10,000 | 4,179,000 |  |  | 4,189,000
Issuance of common stock, net of offering costs under open market sale agreement (ATM), shares |  |  | 1,038,134 |  |  |  |
Net loss |  |  |  |  | (32,575,000) |  | (32,575,000)
Other comprehensive loss |  |  |  |  |  | (17,000) | (17,000)
Reverse stock-split adjustment |  |  | 1,408,000 | (1,408,000) |  |  |
Issuance of Series A and Series B Convertible Redeemable Preferred Stock | $ 17,974,000 | $ 4,494,000 |  |  |  |  |
Issuance of Series A and Series B Convertible Redeemable Preferred Stock, shares | 1,000,006 | 250,005 |  |  |  |  |
Deemed dividends related to Series A and Series B Convertible Redeemable Preferred Stock | $ 3,026,000 | $ 756,000 |  | (3,782,000) |  |  | (3,782,000)
Redemption of Series A and Series B Convertible Redeemable Preferred Stock | $ (21,000,000) | $ (5,250,000) |  |  |  |  |
Redemption of Series A and Series B Convertible Redeemable Preferred Stock, shares | (1,000,006) | (250,005) |  |  |  |  |
Reverse stock-split adjustment |  |  | (1,408,000) | 1,408,000 |  |  |
Ending balance, value at Sep. 30, 2022 |  |  | $ 77,000 | 700,583,000 | (688,215,000) | (44,000) | 12,401,000
Ending balance, shares at Sep. 30, 2022 |  |  | 7,671,351 |  |  |  |
Beginning balance, value at Jun. 30, 2022 |  |  | $ 1,467,000 | 694,372,000 | (681,781,000) | (34,000) | 14,024,000
Beginning balance, shares at Jun. 30, 2022 |  |  | 5,870,375 |  |  |  |
Stock-based compensation expense |  |  |  | 632,000 |  |  | 632,000
Issuance of common stock in connection with restricted share awards, net of cancellations |  |  | $ 8,000 | (8,000) |  |  |
Issuance of common stock in connection with restricted share awards, net of cancellations, shares |  |  | 762,842 |  |  |  |
Issuance of common stock, net of offering costs under open market sale agreement (ATM) |  |  | $ 10,000 | 4,179,000 |  |  | 4,189,000
Issuance of common stock, net of offering costs under open market sale agreement (ATM), shares |  |  | 1,038,134 |  |  |  |
Net loss |  |  |  |  | (6,434,000) |  | (6,434,000)
Other comprehensive loss |  |  |  |  |  | (10,000) | (10,000)
Reverse stock-split adjustment |  |  | (1,408,000) | 1,408,000 |  |  |
Deemed dividends related to Series A and Series B Convertible Redeemable Preferred Stock |  |  |  |  |  |  |
Reverse stock-split adjustment |  |  | 1,408,000 | (1,408,000) |  |  |
Ending balance, value at Sep. 30, 2022 |  |  | $ 77,000 | 700,583,000 | (688,215,000) | (44,000) | 12,401,000
Ending balance, shares at Sep. 30, 2022 |  |  | 7,671,351 |  |  |  |
Beginning balance, value at Dec. 31, 2022 |  |  | $ 177,000 | 722,049,000 | (695,336,000) | (129,000) | 26,761,000
Beginning balance, shares at Dec. 31, 2022 |  |  | 17,719,720 |  |  |  |
Stock-based compensation expense |  |  |  | 3,254,000 |  |  | 3,254,000
Issuance of common stock in connection with restricted share awards, net of cancellations |  |  | $ 18,000 | (31,000) |  |  | (13,000)
Issuance of common stock in connection with restricted share awards, net of cancellations, shares |  |  | 1,719,460 |  |  |  |
Issuance of common stock, net of offering costs under open market sale agreement (ATM) |  |  | $ 20,000 | 6,603,000 |  |  | 6,623,000
Issuance of common stock, net of offering costs under open market sale agreement (ATM), shares |  |  | 1,990,321 |  |  |  |
Net loss |  |  |  |  | (37,597,000) |  | (37,597,000)
Other comprehensive loss |  |  |  |  |  | 30,000 | 30,000
Issuance of common stock, net of offering costs under direct placement offering |  |  | 32,000 | 22,948,000 |  |  | 22,980,000
Issuance of common stock, net of offering costs under direct placement offering, shares |  |  |  |  |  |  | 3,284,407
Deemed dividends related to Series A and Series B Convertible Redeemable Preferred Stock |  |  |  |  |  |  |
Ending balance, value at Sep. 30, 2023 |  |  | $ 247,000 | 754,823,000 | (732,933,000) | (99,000) | 22,038,000
Ending balance, shares at Sep. 30, 2023 |  |  | 24,713,908 |  |  |  |
Beginning balance, value at Jun. 30, 2023 |  |  | $ 215,000 | 730,322,000 | (721,097,000) | (95,000) | 9,345,000
Beginning balance, shares at Jun. 30, 2023 |  |  | 21,478,157 |  |  |  |
Stock-based compensation expense |  |  |  | 1,557,000 |  |  | 1,557,000
Issuance of common stock in connection with restricted share awards, net of cancellations |  |  |  | (4,000) |  |  | (4,000)
Issuance of common stock in connection with restricted share awards, net of cancellations, shares |  |  | (48,656) |  |  |  |
Issuance of common stock, net of offering costs under open market sale agreement (ATM) |  |  | $ 32,000 | 22,948,000 |  |  | 22,980,000
Issuance of common stock, net of offering costs under open market sale agreement (ATM), shares |  |  | 3,284,407 |  |  |  |
Net loss |  |  |  |  | (11,836,000) |  | (11,836,000)
Other comprehensive loss |  |  |  |  |  | (4,000) | (4,000)
Deemed dividends related to Series A and Series B Convertible Redeemable Preferred Stock |  |  |  |  |  |  |
Ending balance, value at Sep. 30, 2023 |  |  | $ 247,000 | $ 754,823,000 | $ (732,933,000) | $ (99,000) | $ 22,038,000
Ending balance, shares at Sep. 30, 2023 |  |  | 24,713,908 |  |  |  |

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