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Changes in Stockholders' Equity | 9 Months Ended
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Sep. 30, 2025
Changes in Stockholders' Equity |
Changes in Stockholders' Equity | (3) Changes in Stockholders’ Equity ​ Three and Nine Months Ended September 30, 2025 and 2024 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | ​ | Accumulated | ​ | ​ |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Common Stock | ​ | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares |  | Amount | ​ | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
Balance, June 30, 2025 | ​ | 323,762 | ​ | $ | 32 | ​ | $ | 1,104,880 | ​ | $ | 133 | ​ | $ | (551,782) | ​ | $ | 553,263
Issuance of common stock upon exercise of stock options | ​ | 399 | ​ | ​ | 1 | ​ | ​ | 365 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 366
Issuance of common stock upon exercise of common stock warrants | ​ | 227 | ​ | ​ | — | ​ | ​ | 3,876 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,876
Issuance of common stock upon release of restricted stock units ("RSUs") |  | 920 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Vesting of Sponsor Redemption-Based Vesting Shares | ​ | — | ​ | ​ | — |  |  | 10,433 |  |  | — |  |  | — |  |  | 10,433
Stock-based compensation |  | — | ​ | ​ | — |  | ​ | 4,299 |  |  | — |  |  | — |  |  | 4,299
Foreign currency translation loss |  | — |  |  | — |  |  | — |  |  | (73) | ​ |  | — |  |  | (73)
Change in unrealized gain on available-for-sale securities |  | — |  |  | — |  |  | — |  |  | 630 |  |  | — |  |  | 630
Net loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (200,968) |  |  | (200,968)
Balance, September 30, 2025 |  | 325,308 | ​ | $ | 33 | ​ | $ | 1,123,853 | ​ | $ | 690 | ​ | $ | (752,750) | ​ | $ | 371,826
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | Accumulated |  | ​ | ​ |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Common Stock | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares |  | Amount | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
Balance, December 31, 2024 | ​ | 283,547 | ​ | $ | 29 | ​ | $ | 681,202 | ​ | $ | 105 | ​ | $ | (554,747) | ​ | $ | 126,589
Issuance of common stock upon exercise of stock options | ​ | 1,994 | ​ | ​ | 1 | ​ | ​ | 1,808 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,809
Issuance of common stock upon exercise of common stock warrants | ​ | 283 | ​ | ​ | — | ​ | ​ | 4,609 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,609
Issuance of common stock upon release of RSUs |  | 6,154 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Proceeds from sale of common stock from Quanta private placement transaction | ​ | 3,020 | ​ | ​ | — | ​ | ​ | 35,000 | ​ | ​ | — |  |  | — | ​ | ​ | 35,000
Proceeds from sale of common stock through At-The-Market ("ATM") Offering | ​ | 30,310 | ​ | ​ | 3 | ​ | ​ | 346,716 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 346,719
Vesting of Promote Sponsor Vesting Shares | ​ | — | ​ | ​ | — | ​ | ​ | 32,946 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 32,946
Vesting of Sponsor Redemption-Based Vesting Shares | ​ | — | ​ | ​ | — | ​ | ​ | 10,433 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,433
Capitalization of offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (888) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (888)
Stock-based compensation |  | — | ​ | ​ | — |  | ​ | 12,027 |  |  | — |  |  | — |  |  | 12,027
Foreign currency translation loss |  | — |  |  | — |  |  | — |  |  | (102) | ​ |  | — |  |  | (102)
Change in unrealized gain on available-for-sale securities |  | — |  |  | — |  |  | — |  |  | 687 |  |  | — |  |  | 687
Net loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (198,003) |  |  | (198,003)
Balance, September 30, 2025 |  | 325,308 | ​ | $ | 33 | ​ | $ | 1,123,853 | ​ | $ | 690 | ​ | $ | (752,750) | ​ | $ | 371,826
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | Accumulated |  | ​ | ​ |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Common Stock | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares |  | Amount | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
Balance, June 30, 2024 |  | 179,597 | ​ | $ | 17 | ​ | $ | 508,971 | ​ | $ | 123 | ​ | $ | (386,953) | ​ | $ | 122,158
Issuance of common stock upon exercise of stock options | ​ | 57 | ​ | ​ | — | ​ | ​ | 15 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15
Issuance of common stock upon release of RSUs | ​ | 1,010 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Proceeds from sale of common stock through ATM Offering | ​ | 11,294 | ​ | ​ | 2 | ​ | ​ | 11,996 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 11,998
Capitalization of deferred offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (58) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (58)
Stock-based compensation | ​ | — | ​ | ​ | — | ​ | ​ | 3,427 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,427
Foreign currency translation loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 61 | ​ | ​ | — | ​ | ​ | 61
Change in unrealized loss on available-for-sale securities | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 70 | ​ | ​ | — | ​ | ​ | 70
Net loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (14,833) | ​ | ​ | (14,833)
Balance, September 30, 2024 |  | 191,958 | ​ | $ | 19 | ​ | $ | 524,351 | ​ | $ | 254 | ​ | $ | (401,786) | ​ | $ | 122,838
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | Accumulated |  |  | ​ |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Common Stock | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares |  | Amount | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
Balance, December 31, 2023 |  | 147,066 | ​ | $ | 14 | ​ | $ | 463,089 | ​ | $ | 244 | ​ | $ | (353,759) | ​ | $ | 109,588
Issuance of common stock upon exercise of stock options | ​ | 307 | ​ | ​ | — | ​ | ​ | 83 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 83
Issuance of common stock upon release of RSUs | ​ | 3,810 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Proceeds from sale of common stock through Purchase Agreement - B. Riley | ​ | 10,057 | ​ | ​ | 1 | ​ | ​ | 12,837 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 12,838
Proceeds from sale of common stock through ATM Offering | ​ | 30,718 | ​ | ​ | 4 | ​ | ​ | 38,827 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 38,831
Capitalization of deferred offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (190) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (190)
Stock-based compensation | ​ | — | ​ | ​ | — | ​ | ​ | 9,705 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,705
Foreign currency translation loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (44) | ​ | ​ | — | ​ | ​ | (44)
Change in unrealized loss on available-for-sale securities | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 54 | ​ | ​ | — | ​ | ​ | 54
Net loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (48,027) | ​ | ​ | (48,027)
Balance, September 30, 2024 |  | 191,958 | ​ | $ | 19 | ​ | $ | 524,351 | ​ | $ | 254 | ​ | $ | (401,786) | ​ | $ | 122,838
​

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