Stock Repurchase Program	12 Months Ended
Dec. 31, 2025
Stock Repurchase Program [Abstract]
Stock Repurchase Program	Stock Repurchase Program On March 30, 2021, Harbor's board of directors adopted a stock repurchase program pursuant to which Harbor was initially authorized to repurchase up to $1,000 of shares of its common stock during the first calendar month of the program, subject to an automatic increase of $1,000 per calendar month thereafter. The number of shares to be repurchased, and the timing of any such repurchases, depends on a number of factors, including the trading price and volume of the common stock, the Company's business strategy, financial performance, liquidity position and capital requirements, restrictions in commercial agreements, general market conditions, applicable legal requirements and other factors. Repurchases may be effected through open market transactions, privately negotiated transactions, or any other lawful means. Harbor may, but is not required to, effect repurchases under a trading plan adopted pursuant to Rule 10b5-1 under the Exchange Act, or subject to Rule 10b-18 under the Exchange Act. Harbor is not obligated under the program to acquire any particular dollar amount or number of shares, and the program may be modified, suspended or terminated at any time and for any reason. Due to its failure to timely file certain reports with the SEC, Harbor has not repurchased shares pursuant to the program since March 31, 2025. In January 2023, a federal corporate stock repurchase excise tax of 1.0% took effect once share repurchases exceed $1,000. Harbor accrued an excise tax liability of $— and $20 during the years ended December 31, 2025 and December 31, 2024, respectively, which is included in the cost of Treasury stock in the consolidated statements of stockholders’ equity. Harbor acquired a total of 63,925 and 1,132,594 shares of its common stock pursuant to the stock repurchase program in the years ended December 31, 2025 and December 31, 2024, respectively, provided no shares were repurchased after March 31, 2025 due to its failure to timely file certain reports with the SEC. From the inception of the program through December 31, 2025, Harbor purchased approximately 12,933,469 shares of its common stock pursuant to the program. As of December 31, 2025, total cash of $299 is held for the repurchase of shares under the stock repurchase program, compared to $344 as of December 31, 2024, which is reflected as restricted cash in the consolidated financial statements.

On March 30, 2021, Harbor's board of directors adopted a stock repurchase program pursuant to which Harbor was initially authorized to repurchase up to $1,000 of shares of its common stock during the first calendar month of the program, subject to an automatic increase of $1,000 per calendar month thereafter. The number of shares to be repurchased, and the timing of any such repurchases, depends on a number of factors, including the trading price and volume of the common stock, the Company's business strategy, financial performance, liquidity position and capital requirements, restrictions in commercial agreements, general market conditions, applicable legal requirements and other factors. Repurchases may be effected through open market transactions, privately negotiated transactions, or any other lawful means. Harbor may, but is not required to, effect repurchases under a trading plan adopted pursuant to Rule 10b5-1 under the Exchange Act, or subject to Rule 10b-18 under the Exchange Act. Harbor is not obligated under the program to acquire any particular dollar amount or number of shares, and the program may be modified, suspended or terminated at any time and for any reason. Due to its failure to timely file certain reports with the SEC, Harbor has not repurchased shares pursuant to the program since March 31, 2025.

In January 2023, a federal corporate stock repurchase excise tax of 1.0% took effect once share repurchases exceed $1,000. Harbor accrued an excise tax liability of $— and $20 during the years ended December 31, 2025 and December 31, 2024, respectively, which is included in the cost of Treasury stock in the consolidated statements of stockholders’ equity. Harbor acquired a total of 63,925 and 1,132,594 shares of its common stock pursuant to the stock repurchase program in the years ended December 31, 2025 and December 31, 2024, respectively, provided no shares were repurchased after March 31, 2025 due to its failure to timely file certain reports with the SEC. From the inception of the program through December 31, 2025, Harbor purchased approximately 12,933,469 shares of its common stock pursuant to the program.