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Stock-based compensation
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Stock-based compensation Stock-based compensation
Performance and Incentive Pay Plan
On December 29, 2025, at the Company’s Annual Meeting, the 2025 HYMC Performance and Incentive Pay Plan (the “2025 PIPP Plan”) was approved. The 2025 PIPP Plan supersedes and replaces the 2020 HYMC Performance and Incentive Pay Plan (the “2020 PIPP Plan”), except with respect to awards granted under the 2020 PIPP Plan plus any shares of Common Stock which as of the effective date of the 2025 PIPP Plan were available for issuance under the 2020 PIPP Plan, or are subject to 2020 PIPP Plan awards which become available for future grants of awards as defined in the 2025 PIPP Plan. The 2020 PIPP Plan was approved on February 20, 2019, and amended on May 29, 2020, June 2, 2022, and May 23, 2024.
As of December 31, 2025, there were a total of 3,990,281 shares of common stock available for issuance, including 490,281 transferred from the 2020 PIPP Plan. As of December 31, 2024, there were 966,926 shares of common stock available for issuance under the 2020 PIPP Plan.
The following table summarizes the Company’s 2025 PIPP Plan and 2020 PIPP Plan shares available for issuance:
Number of Restricted Stock Units
2025 PIPP Plan
Available for Issuance as of December 31, 20253,500,000 
Plus transferred from 2020 PIPP Plan December 29, 2025490,281 
Total Available for Issuance as of December 31, 20253,990,281 
2020 PIPP Plan
Available for Issuance as of December 31, 2024966,926 
Less Granted in 2025(491,949)
Plus forfeited shares in 202515,304 
Less transferred to 2025 PIPP Plan December 29, 2025(490,281)
Total Available for Issuance as of December 31, 2025— 

As of December 31, 2025, all awards granted under the 2020 PIPP Plan were in the form of restricted stock units to employees and directors of the Company. Restricted stock units granted under the 2020 PIPP Plan without performance-based vesting criteria typically vest in either equal annual installments over one to four years, or in entirety on the fourth anniversary after the grant date. Awards granted with performance-based vesting criteria typically vest in annual installments over three years subject to the achievement of certain financial and operating results of the Company. Certain restricted stock units granted to non-employee directors vest immediately, while others vest in installments over a one-to-three year period.

The following tables summarize the Company’s unvested share awards outstanding as of December 31, 2025 and 2024, under the 2020 PIPP Plan:
Number of Restricted Stock UnitsWeighted Average Grant Date
Fair Value Per Unit
Unvested at December 31, 2024678,071 $5.13 
Granted491,949 3.13 
Canceled/forfeited(15,304)4.93 
Vested(425,742)5.56 
Unvested at December 31, 2025728,974$3.56 
Number of Restricted Stock UnitsWeighted Average Grant Date
Fair Value Per Unit
Unvested at December 31, 2023607,099 $10.04 
Granted435,204 3.34 
Canceled/forfeited(20,014)5.82 
Vested(344,218)11.50 
Unvested at December 31, 2024678,071$5.13 

In addition to the 728,974 unvested RSUs as of December 31, 2025, there were 95,611 vested and deferred RSUs. Unvested RSUs are subject to forfeiture if the employee or director leaves the Company prior to the vesting date. Vested and deferred RSUs have fully vested but are deferred based on the Company’s directors’ annual elections. Vested and deferred RSUs will be issued, or settled, following the director’s separation of service from the Company.
The fair value of RSUs is based on the closing market price of the Company’s common stock on the date of the grant. The Company recognizes compensation expense for RSUs on a straight-line basis over the grant period.
During the years ended December 31, 2025 and 2024, the Company recorded compensation expense of $1.9 million and $2.6 million, respectively, related to restricted stock awards.
As of December 31, 2025, there was $1.6 million of unrecognized compensation cost related to unvested restricted stock units, expected to be recognized over a weighted-average period of 1.5 years