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Investments (Tables) | 12 Months Ended
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Dec. 31, 2023
Investments |
Schedule of gross unrealized gains and losses, and the amortized cost, allowance for credit losses, and fair value of those investments classified as available-for-sale | ​ The amortized cost, gross unrealized gains and losses, fair value of those investments classified as available-for-sale, and allowance for credit losses at December 31, 2022 are summarized as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | Amortized | ​ | Gross | ​ | Gross | ​ | Fair | ​ | Allowance for
​ | Cost |  | Unrealized Gains |  | Unrealized Losses |  | Value |  | Credit Losses
Corporate bonds | $ | 200,735 | ​ | $ | 7 | ​ | $ | (7,109) | ​ | $ | 193,633 | ​ | ​ | —
U.S. Treasuries | ​ | 1,154,879 | ​ | ​ | 111 | ​ | ​ | (15,680) | ​ | ​ | 1,139,310 | ​ | ​ | —
Total | $ | 1,355,614 | ​ | $ | 118 | ​ | $ | (22,789) | ​ | $ | 1,332,943 | ​ | $ | —
​
Schedule of investments classified as equity securities | The cost, gross unrealized gains and losses, and fair value of those investments classified as equity securities at December 31, 2022 are summarized as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | December 31, 2022
​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | Fair
​ | ​ | Cost | ​ | Unrealized Gains | ​ | Unrealized Losses | ​ | Value
Fixed income mutual funds | $ | 70,257 |  | $ | — | ​ | $ | (2,620) | ​ | $ | 67,637
Exchange traded mutual funds | ​ | 75,999 | ​ | ​ | — | ​ | ​ | (8,800) | ​ | ​ | 67,199
Total | $ | 146,256 | ​ | $ | — | ​ | $ | (11,420) | ​ | $ | 134,836
Schedule of the amortized cost and fair value of investments classified as available-for-sale, by contractual maturity | A summary of the amortized cost and fair value of investments classified as available-for-sale, by contractual maturity, as of December 31, is as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | December 31, 2023 | ​ | December 31, 2022
​ | ​ | Amortized | ​ | Fair | ​ | ​ | Amortized | ​ | Fair
Maturity: | ​ | Cost | ​ | Value | ​ | ​ | Cost | ​ | Value
Less than 12 months | $ | — |  | $ | — | ​ | $ | 1,045,120 |  | $ | 1,039,333
12 months or greater |  | — | ​ |  | — | ​ |  | 310,494 | ​ |  | 293,610
Total | $ | — | ​ | $ | — | ​ | $ | 1,355,614 | ​ | $ | 1,332,943
​
Summary of investments under the equity method | As of December 31, 2023 and December 31, 2022, the Company accounted for the following investments in the investee’s common stock under the equity method, which are included in the investments in non-consolidated entities and non-marketable equity securities on the consolidated balance sheets (amounts in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | As of December 31, 2023 | ​ | As of December 31, 2022
​ |  | Formation | ​ | Common Stock |  | Carrying | ​ | Common Stock |  | Carrying
Investee | ​ | Date | ​ | Ownership % | ​ | Value | ​ | Ownership % | ​ | Value
HyVia | ​ | Q2 2021 | ​ | 50% | ​ | $ | (2,068) | ​ | 50% | ​ | $ | 11,281
AccionaPlug S.L. | ​ | Q4 2021 | ​ | 50% | ​ | ​ | 3,198 | ​ | 50% | ​ | ​ | 2,225
Clean H2 Infra Fund | ​ | Q4 2021 | ​ | 5% | ​ | ​ | 13,357 | ​ | 5% | ​ | ​ | 3,922
SK Plug Hyverse | ​ | Q1 2022 | ​ | 49% | ​ | ​ | 41,609 | ​ | 49% | ​ | ​ | 8,937
​ | ​ | ​ | ​ | ​ | ​ | $ | 56,096 | ​ | ​ | ​ | $ | 26,365
Schedule Of capital commitments | The Company had the following capital commitments related to its equity method investments as of December 31 as follows (in thousands): ​
​ | ​ | ​
2024 | $ | 152,672
2025 | ​ | 17,300
Total | $ | 169,972
​

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