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Pay vs Performance Disclosure - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pay vs Performance Disclosure |  |  |  |  |
Pay vs Performance Disclosure, Table | PAY VERSUS PERFORMANCE The following table sets forth information about executive compensation, compensation paid and the Company’s performance.
​ | Year | ​ | ​ | Summary Compensation Table Total for PEO Berle(1) | ​ | ​ | Summary Compensation Table Total for PEO Lindblad(1) | ​ | ​ | Compensation Actually Paid to PEO Berle(1)(2)(3) | ​ | ​ | Compensation Actually Paid to PEO Lindblad(1)(2)(3) | ​ | ​ | Average Summary Compensation Table Total for Non-PEO NEOs(1) | ​ | ​ | Average Compensation Actually Paid to Non-PEO NEOs(1)(2)(3) | ​ | ​ | Value of $100 Investment Based On:(4) | ​ | ​ | Net Loss Available to Stockholders (millions) | ​ | ​ | Adjusted EDITDA (millions)(6) | ​
​ | Total Shareholder Return | ​ | ​ | Peer Group Total Shareholder Return(5) | ​
​ | (a) | ​ | ​ | (b) | ​ | ​ | (c) | ​ | ​ | (d) | ​ | ​ | (e) | ​ | ​ | (f) | ​ | ​ | (g) | ​ | ​ | (h) | ​ | ​ | (i) | ​ | ​ | (j) | ​ | ​ | (k) | ​
​ | 2024 | ​ | ​ | ​ | ​ | N/A | ​ | ​ | ​ | ​ | $ | 725,101 | ​ | ​ | ​ | ​ | ​ | N/A | ​ | ​ | ​ | ​ | $ | 578,526 | ​ | ​ | ​ | ​ | $ | 2,452,181 | ​ | ​ | ​ | ​ | $ | 2,639,717 | ​ | ​ | ​ | ​ | $ | 72.54 | ​ | ​ | ​ | ​ | $ | 149.90 | ​ | ​ | ​ | ​ | $ | (35.8) | ​ | ​ | ​ | ​ | $ | 91.2 | ​ | ​
​ | 2023 | ​ | ​ | ​ | $ | 1,463,127 | ​ | ​ | ​ | ​ | $ | 2,352,502 | ​ | ​ | ​ | ​ | $ | (1,805,574) | ​ | ​ | ​ | ​ | $ | 2,763,516 | ​ | ​ | ​ | ​ | $ | 1,959,443 | ​ | ​ | ​ | ​ | $ | 2,147,119 | ​ | ​ | ​ | ​ | $ | 68.93 | ​ | ​ | ​ | ​ | $ | 114.20 | ​ | ​ | ​ | ​ | $ | (50.0) | ​ | ​ | ​ | ​ | $ | 71.2 | ​ | ​
​ | 2022 | ​ | ​ | ​ | $ | 1,635,303 | ​ | ​ | ​ | ​ | ​ | N/A | ​ | ​ | ​ | ​ | $ | (3,740,733) | ​ | ​ | ​ | ​ | ​ | N/A | ​ | ​ | ​ | ​ | $ | 1,827,250 | ​ | ​ | ​ | ​ | $ | 722,410 | ​ | ​ | ​ | ​ | $ | 47.09 | ​ | ​ | ​ | ​ | $ | 71.38 | ​ | ​ | ​ | ​ | $ | (116.1) | ​ | ​ | ​ | ​ | $ | (11.5) | ​ | ​
​ | 2021 | ​ | ​ | ​ | $ | 6,936,263 | ​ | ​ | ​ | ​ | $ | 811,127 | ​ | ​ | ​ | ​ | $ | 10,277,472 | ​ | ​ | ​ | ​ | $ | (896,178) | ​ | ​ | ​ | ​ | $ | 967,846 | ​ | ​ | ​ | ​ | $ | 719,423 | ​ | ​ | ​ | ​ | $ | 95.41 | ​ | ​ | ​ | ​ | $ | 94.10 | ​ | ​ | ​ | ​ | $ | (124.7) | ​ | ​ | ​ | ​ | $ | (64.0) | ​ | ​
​ | 2020 | ​ | ​ | ​ | ​ | N/A | ​ | ​ | ​ | ​ | $ | 2,376,852 | ​ | ​ | ​ | ​ | ​ | N/A | ​ | ​ | ​ | ​ | $ | 3,021,481 | ​ | ​ | ​ | ​ | $ | 1,691,674 | ​ | ​ | ​ | ​ | $ | 2,108,405 | ​ | ​ | ​ | ​ | $ | 104.71 | ​ | ​ | ​ | ​ | $ | 77.36 | ​ | ​ | ​ | ​ | $ | (100.4) | ​ | ​ | ​ | ​ | $ | (52.2) | ​ | ​
​ (1) Mr. Berle was the Principle Executive Officer (“PEO”) during 2023, 2022 and 2021, Mr. Lindblad was the PEO during 2024, 2023, 2021 and 2020. The Non-PEO NEOs for each year were Mr. Goldberg, Mr. Dryden, Mr. Felenstein, Mr. Byus and Mr. Bressler, and Mr. Brodsky for 2024, 2023 and 2022, and included Mr. Goodman for 2022, 2021 and 2020. Mr. Berle’s 2021 compensation included $5.2 million of option awards, and $1.0 million of RSUs which were awarded with a five-year vesting period, on condition that he purchase $1.0 million of Company stock, which was done before the RSUs were awarded. ​ (2) The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table total with certain adjustments as described in footnote 3 below. ​ (3) Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards and Option Awards column are the totals from the Stock Awards and Option Awards columns set forth in the Summary Compensation Table. Amounts in the Exclusion of Change in Pension Value column reflect the amounts attributable to the Change in Pension Value reported in the Summary Compensation Table. Amounts in the Inclusion of Pension Service Cost are based on the service cost for services rendered during the listed year. The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables: ​
​ | ​ | ​ | PEO Berle | ​
​ | ​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​
SCT Total | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 6,936,263 | ​ | ​ | ​ | ​ | $ | 1,635,303 | ​ | ​ | ​ | ​ | $ | 1,463,127 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
- Grant Date Fair Value of Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (6,242,973) | ​ | ​ | ​ | ​ | ​ | (575,000) | ​ | ​ | ​ | ​ | ​ | (1,149,992) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Fair Value at Fiscal Year-End of Outstanding and Unvested Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 9,584,182 | ​ | ​ | ​ | ​ | ​ | 278,231 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value of Outstanding and Unvested Option Awards and Stock Awards Granted in Prior Fiscal Years | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (4,429,394) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Fair Value at Vesting of Option Awards and Stock Awards Granted in Fiscal Year That Vested During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value as of Vesting Date of Option Awards and Stock Awards Granted in Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (649,872) | ​ | ​ | ​ | ​ | ​ | 539,052 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
- Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (2,657,761) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
Compensation Actually Paid | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 10,277,472 | ​ | ​ | ​ | ​ | $ | (3,740,733) | ​ | ​ | ​ | ​ | $ | (1,805,574) | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | ​ | ​ | PEO Lindblad | ​
​ | ​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​
SCT Total | ​ | ​ | ​ | $ | 2,376,852 | ​ | ​ | ​ | ​ | $ | 811,127 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 2,352,502 | ​ | ​ | ​ | ​ | $ | 725,101 | ​ | ​
- Grant Date Fair Value of Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | (1,912,242) | ​ | ​ | ​ | ​ | ​ | (772,519) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (1,996,000) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Fair Value at Fiscal Year-End of Outstanding and Unvested Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | 3,458,773 | ​ | ​ | ​ | ​ | ​ | 748,831 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,254,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value of Outstanding and Unvested Option Awards and Stock Awards Granted in Prior Fiscal Years | ​ | ​ | ​ | ​ | (277,732) | ​ | ​ | ​ | ​ | ​ | (466,575) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 76,040 | ​ | ​ | ​ | ​ | ​ | 59,000 | ​ | ​
+ Fair Value at Vesting of Option Awards and Stock Awards Granted in Fiscal Year That Vested During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value as of Vesting Date of Option Awards and Stock Awards Granted in Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year | ​ | ​ | ​ | ​ | (624,171) | ​ | ​ | ​ | ​ | ​ | 124,019 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 107,579 | ​ | ​ | ​ | ​ | ​ | (205,575) | ​ | ​
- Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (1,341,061) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (30,605) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
Compensation Actually Paid | ​ | ​ | ​ | $ | 3,021,481 | ​ | ​ | ​ | ​ | $ | (896,178) | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 2,763,516 | ​ | ​ | ​ | ​ | $ | 578,526 | ​ | ​
​ | ​ | ​ | NEO | ​
​ | ​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​
SCT Total | ​ | ​ | ​ | $ | 1,691,674 | ​ | ​ | ​ | ​ | $ | 967,846 | ​ | ​ | ​ | ​ | $ | 1,827,250 | ​ | ​ | ​ | ​ | $ | 1,959,443 | ​ | ​ | ​ | ​ | $ | 2,452,181 | ​ | ​
- Grant Date Fair Value of Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | (1,088,231) | ​ | ​ | ​ | ​ | ​ | (345,728) | ​ | ​ | ​ | ​ | ​ | (1,010,633) | ​ | ​ | ​ | ​ | ​ | (942,749) | ​ | ​ | ​ | ​ | ​ | (1,704,650) | ​ | ​
+ Fair Value at Fiscal Year-End of Outstanding and Unvested Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | 1,951,502 | ​ | ​ | ​ | ​ | ​ | 303,478 | ​ | ​ | ​ | ​ | ​ | 341,776 | ​ | ​ | ​ | ​ | ​ | 1,078,747 | ​ | ​ | ​ | ​ | ​ | 719,391 | ​ | ​
+ Change in Fair Value of Outstanding and Unvested Option Awards and Stock Awards Granted in Prior Fiscal Years | ​ | ​ | ​ | ​ | (49,992) | ​ | ​ | ​ | ​ | ​ | (239,077) | ​ | ​ | ​ | ​ | ​ | (363,226) | ​ | ​ | ​ | ​ | ​ | 189,140 | ​ | ​ | ​ | ​ | ​ | 38,540 | ​ | ​
+ Fair Value at Vesting of Option Awards and Stock Awards Granted in Fiscal Year That Vested During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,504,918 | ​ | ​
+ Change in Fair Value as of Vesting Date of Option Awards and Stock Awards Granted in Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year | ​ | ​ | ​ | ​ | (244,063) | ​ | ​ | ​ | ​ | ​ | 32,904 | ​ | ​ | ​ | ​ | ​ | (72,757) | ​ | ​ | ​ | ​ | ​ | 43,649 | ​ | ​ | ​ | ​ | ​ | (80,734) | ​ | ​
- Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year | ​ | ​ | ​ | ​ | (152,485) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (181,111) | ​ | ​ | ​ | ​ | ​ | (289,929) | ​ | ​
Compensation Actually Paid | ​ | ​ | ​ | $ | 2,108,405 | ​ | ​ | ​ | ​ | $ | 719,423 | ​ | ​ | ​ | ​ | $ | 722,410 | ​ | ​ | ​ | ​ | $ | 2,147,119 | ​ | ​ | ​ | ​ | $ | 2,639,717 | ​ | ​
​ (4) Total Shareholder Return (TSR) is cumulative for the measurement periods beginning on December 31, 2019 and ending on the last day in FY 2024, 2023, 2022, 2021 and 2020, respectively, calculated in accordance with Item 201(e) of Regulation S-K. ​ (5) “Prior Peer Group” represents the FTSE 100 Index, and “Current Peer Group” represents the S&P 1500 Hotels, Resorts and Cruise Lines Index, which the Company has identified as its peer group for purposes of Item 402(v) and which is used by the Company for purposes of compliance with Item 201(e) of Regulation S-K. ​ (6) We have determined that Adjusted EBITDA is the financial performance measure that, in our assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used to link compensation actually paid to our named executive officers, for the most recently completed fiscal year, to company performance. A reconciliation of Adjusted EBITDA can be found in our Annual Report. ​ |  |  |  |
Company Selected Measure Name | Adjusted EDITDA |  |  |  |
Named Executive Officers, Footnote | (1) Mr. Berle was the Principle Executive Officer (“PEO”) during 2023, 2022 and 2021, Mr. Lindblad was the PEO during 2024, 2023, 2021 and 2020. The Non-PEO NEOs for each year were Mr. Goldberg, Mr. Dryden, Mr. Felenstein, Mr. Byus and Mr. Bressler, and Mr. Brodsky for 2024, 2023 and 2022, and included Mr. Goodman for 2022, 2021 and 2020. Mr. Berle’s 2021 compensation included $5.2 million of option awards, and $1.0 million of RSUs which were awarded with a five-year vesting period, on condition that he purchase $1.0 million of Company stock, which was done before the RSUs were awarded. (2) The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K and do not reflect compensation actually earned, realized, or received by the Company’s NEOs. These amounts reflect the Summary Compensation Table total with certain adjustments as described in footnote 3 below. |  |  |  |
Peer Group Issuers, Footnote | (5) “Prior Peer Group” represents the FTSE 100 Index, and “Current Peer Group” represents the S&P 1500 Hotels, Resorts and Cruise Lines Index, which the Company has identified as its peer group for purposes of Item 402(v) and which is used by the Company for purposes of compliance with Item 201(e) of Regulation S-K. |  |  |  |
Adjustment To PEO Compensation, Footnote | (3) Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards and Option Awards column are the totals from the Stock Awards and Option Awards columns set forth in the Summary Compensation Table. Amounts in the Exclusion of Change in Pension Value column reflect the amounts attributable to the Change in Pension Value reported in the Summary Compensation Table. Amounts in the Inclusion of Pension Service Cost are based on the service cost for services rendered during the listed year. The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables: ​
​ | ​ | ​ | PEO Berle | ​
​ | ​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​
SCT Total | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 6,936,263 | ​ | ​ | ​ | ​ | $ | 1,635,303 | ​ | ​ | ​ | ​ | $ | 1,463,127 | ​ | ​ | ​ | ​ | $ | — | ​ | ​
- Grant Date Fair Value of Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (6,242,973) | ​ | ​ | ​ | ​ | ​ | (575,000) | ​ | ​ | ​ | ​ | ​ | (1,149,992) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Fair Value at Fiscal Year-End of Outstanding and Unvested Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 9,584,182 | ​ | ​ | ​ | ​ | ​ | 278,231 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value of Outstanding and Unvested Option Awards and Stock Awards Granted in Prior Fiscal Years | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (4,429,394) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Fair Value at Vesting of Option Awards and Stock Awards Granted in Fiscal Year That Vested During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value as of Vesting Date of Option Awards and Stock Awards Granted in Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (649,872) | ​ | ​ | ​ | ​ | ​ | 539,052 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
- Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (2,657,761) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
Compensation Actually Paid | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 10,277,472 | ​ | ​ | ​ | ​ | $ | (3,740,733) | ​ | ​ | ​ | ​ | $ | (1,805,574) | ​ | ​ | ​ | ​ | $ | — | ​ | ​
​ | ​ | ​ | PEO Lindblad | ​
​ | ​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​
SCT Total | ​ | ​ | ​ | $ | 2,376,852 | ​ | ​ | ​ | ​ | $ | 811,127 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 2,352,502 | ​ | ​ | ​ | ​ | $ | 725,101 | ​ | ​
- Grant Date Fair Value of Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | (1,912,242) | ​ | ​ | ​ | ​ | ​ | (772,519) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (1,996,000) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Fair Value at Fiscal Year-End of Outstanding and Unvested Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | 3,458,773 | ​ | ​ | ​ | ​ | ​ | 748,831 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,254,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value of Outstanding and Unvested Option Awards and Stock Awards Granted in Prior Fiscal Years | ​ | ​ | ​ | ​ | (277,732) | ​ | ​ | ​ | ​ | ​ | (466,575) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 76,040 | ​ | ​ | ​ | ​ | ​ | 59,000 | ​ | ​
+ Fair Value at Vesting of Option Awards and Stock Awards Granted in Fiscal Year That Vested During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
+ Change in Fair Value as of Vesting Date of Option Awards and Stock Awards Granted in Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year | ​ | ​ | ​ | ​ | (624,171) | ​ | ​ | ​ | ​ | ​ | 124,019 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 107,579 | ​ | ​ | ​ | ​ | ​ | (205,575) | ​ | ​
- Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (1,341,061) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (30,605) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​
Compensation Actually Paid | ​ | ​ | ​ | $ | 3,021,481 | ​ | ​ | ​ | ​ | $ | (896,178) | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 2,763,516 | ​ | ​ | ​ | ​ | $ | 578,526 | ​ | ​
Non-PEO NEO Average Total Compensation Amount | $ 2,452,181 | $ 1,959,443 | $ 1,827,250 | $ 967,846 | $ 1,691,674
Non-PEO NEO Average Compensation Actually Paid Amount | $ 2,639,717 | 2,147,119 | 722,410 | 719,423 | 2,108,405
Adjustment to Non-PEO NEO Compensation Footnote | (3) Compensation Actually Paid reflects the exclusions and inclusions of certain amounts for the PEO and the Non-PEO NEOs as set forth below. Equity values are calculated in accordance with FASB ASC Topic 718. Amounts in the Exclusion of Stock Awards and Option Awards column are the totals from the Stock Awards and Option Awards columns set forth in the Summary Compensation Table. Amounts in the Exclusion of Change in Pension Value column reflect the amounts attributable to the Change in Pension Value reported in the Summary Compensation Table. Amounts in the Inclusion of Pension Service Cost are based on the service cost for services rendered during the listed year. The amounts in the Inclusion of Equity Values in the tables above are derived from the amounts set forth in the following tables:
​ | ​ | ​ | NEO | ​
​ | ​ | ​ | 2020 | ​ | ​ | 2021 | ​ | ​ | 2022 | ​ | ​ | 2023 | ​ | ​ | 2024 | ​
SCT Total | ​ | ​ | ​ | $ | 1,691,674 | ​ | ​ | ​ | ​ | $ | 967,846 | ​ | ​ | ​ | ​ | $ | 1,827,250 | ​ | ​ | ​ | ​ | $ | 1,959,443 | ​ | ​ | ​ | ​ | $ | 2,452,181 | ​ | ​
- Grant Date Fair Value of Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | (1,088,231) | ​ | ​ | ​ | ​ | ​ | (345,728) | ​ | ​ | ​ | ​ | ​ | (1,010,633) | ​ | ​ | ​ | ​ | ​ | (942,749) | ​ | ​ | ​ | ​ | ​ | (1,704,650) | ​ | ​
+ Fair Value at Fiscal Year-End of Outstanding and Unvested Option Awards and Stock Awards Granted in Fiscal Year | ​ | ​ | ​ | ​ | 1,951,502 | ​ | ​ | ​ | ​ | ​ | 303,478 | ​ | ​ | ​ | ​ | ​ | 341,776 | ​ | ​ | ​ | ​ | ​ | 1,078,747 | ​ | ​ | ​ | ​ | ​ | 719,391 | ​ | ​
+ Change in Fair Value of Outstanding and Unvested Option Awards and Stock Awards Granted in Prior Fiscal Years | ​ | ​ | ​ | ​ | (49,992) | ​ | ​ | ​ | ​ | ​ | (239,077) | ​ | ​ | ​ | ​ | ​ | (363,226) | ​ | ​ | ​ | ​ | ​ | 189,140 | ​ | ​ | ​ | ​ | ​ | 38,540 | ​ | ​
+ Fair Value at Vesting of Option Awards and Stock Awards Granted in Fiscal Year That Vested During Fiscal Year | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,504,918 | ​ | ​
+ Change in Fair Value as of Vesting Date of Option Awards and Stock Awards Granted in Prior Fiscal Years For Which Applicable Vesting Conditions Were Satisfied During Fiscal Year | ​ | ​ | ​ | ​ | (244,063) | ​ | ​ | ​ | ​ | ​ | 32,904 | ​ | ​ | ​ | ​ | ​ | (72,757) | ​ | ​ | ​ | ​ | ​ | 43,649 | ​ | ​ | ​ | ​ | ​ | (80,734) | ​ | ​
- Fair Value as of Prior Fiscal Year-End of Option Awards and Stock Awards Granted in Prior Fiscal Years That Failed to Meet Applicable Vesting Conditions During Fiscal Year | ​ | ​ | ​ | ​ | (152,485) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (181,111) | ​ | ​ | ​ | ​ | ​ | (289,929) | ​ | ​
Compensation Actually Paid | ​ | ​ | ​ | $ | 2,108,405 | ​ | ​ | ​ | ​ | $ | 719,423 | ​ | ​ | ​ | ​ | $ | 722,410 | ​ | ​ | ​ | ​ | $ | 2,147,119 | ​ | ​ | ​ | ​ | $ | 2,639,717 | ​ | ​
Compensation Actually Paid vs. Total Shareholder Return | Relationship between CAP and TSR. The graph below illustrates the relationship between TSR and the Peer Group TSR as well as the relationship between CAP and TSR for the PEO and average Non-PEO NEOs. |  |  |  |
Compensation Actually Paid vs. Net Income | Relationship between CAP and GAAP Net Income. The graph below reflects the relationship between the PEO and average Non-PEO NEOs CAP and the Company’s Net Income for the applicable fiscal year. |  |  |  |
Compensation Actually Paid vs. Company Selected Measure | Relationship between CAP and Adjusted EBITDA (our Company-Selected Measure). The graph below reflects the relationship between the PEO and average Non-PEO NEOs CAP and the Company’s Adjusted EBITDA for the applicable fiscal year. |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |  |
Tabular List, Table | Performance Measures Used to Link Company Performance and CAP. The following is a list of performance measures, which in our assessment represent the most important performance measures used by the Company to link compensation actually paid to the named executive officers for FY 2024. Each metric below is used for purposes of determining payouts under either our annual incentive program or vesting of our performance-based stock awards. Please see the CD&A for a further description of these metrics and how they are used in the Company’s executive compensation. • Adjusted EBITDA ​ • Net Yield ​ • Stock Price |  |  |  |
Total Shareholder Return Amount | $ 72.54 | 68.93 | 47.09 | 95.41 | 104.71
Peer Group Total Shareholder Return Amount | 149.9 | 114.2 | 71.38 | 94.1 | 77.36
Net Income (Loss) | $ (35,800,000) | $ (50,000,000) | $ (116,100,000) | $ (124,700,000) | $ (100,400,000)
Company Selected Measure Amount | 91,200,000 | 71,200,000 | (11,500,000) | (64,000,000) | (52,200,000)
PEO Name | Mr. Lindblad |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Adjusted EBITDA |  |  |  |
Non-GAAP Measure Description | (6) We have determined that Adjusted EBITDA is the financial performance measure that, in our assessment, represents the most important performance measure (that is not otherwise required to be disclosed in the table) used to link compensation actually paid to our named executive officers, for the most recently completed fiscal year, to company performance. A reconciliation of Adjusted EBITDA can be found in our Annual Report. |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Net Yield |  |  |  |
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Stock Price |  |  |  |
Lindblad [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount | $ 725,101 | $ 2,352,502 |  | $ 811,127 | $ 2,376,852
PEO Actually Paid Compensation Amount | 578,526 | 2,763,516 |  | (896,178) | 3,021,481
Berle [Member] |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount |  | 1,463,127 | 1,635,303 | 6,936,263 |
PEO Actually Paid Compensation Amount |  | (1,805,574) | (3,740,733) | 10,277,472 |
Shares Issued, Value, Share-Based Compensation Arrangement, Stock Option Awards | 5,200,000 |  |  |  |
Shares Issued, Value, Share-Based Compensation Arrangement, Restricted Stock Units | 1,000,000 |  |  |  |
Stock to be Purchased on Condition at Issue of Restricted Stock Units, Value | 1,000,000 |  |  |  |
PEO | Lindblad [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | (1,996,000) |  | (772,519) | (1,912,242)
PEO | Lindblad [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | 2,254,000 |  | 748,831 | 3,458,773
PEO | Lindblad [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 59,000 | 76,040 |  | (466,575) | (277,732)
PEO | Lindblad [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  |  |
PEO | Lindblad [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (205,575) | 107,579 |  | 124,019 | (624,171)
PEO | Lindblad [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | (30,605) |  | (1,341,061) |
PEO | Berle [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | (1,149,992) | (575,000) | (6,242,973) |
PEO | Berle [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | 278,231 | 9,584,182 |
PEO | Berle [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  | (4,429,394) |  |
PEO | Berle [Member] | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  |  |
PEO | Berle [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | 539,052 | (649,872) |  |
PEO | Berle [Member] | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  | (2,657,761) |  |  |
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (1,704,650) | (942,749) | (1,010,633) | (345,728) | (1,088,231)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 719,391 | 1,078,747 | 341,776 | 303,478 | 1,951,502
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 38,540 | 189,140 | (363,226) | (239,077) | (49,992)
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 1,504,918 |  |  |  |
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (80,734) | 43,649 | (72,757) | 32,904 | (244,063)
Non-PEO NEO | Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ (289,929) | $ (181,111) |  |  | $ (152,485)

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