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Changes in Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2025
Changes in Stockholders' Equity |
Changes in Stockholders' Equity | Three and Six Months Ended June 30, 2025 and 2024 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | ​ | Accumulated | ​ | ​ |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Common Stock | ​ | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares |  | Amount | ​ | ​ | Capital | ​ | Income (loss) | ​ | Deficit | ​ | Equity
Balance, March 31, 2025 | ​ | 286,975 | ​ | $ | 29 | ​ | $ | 719,315 | ​ | $ | (88) | ​ | $ | (512,128) | ​ | $ | 207,128
Issuance of common stock upon exercise of stock options | ​ | 1,297 | ​ | ​ | — | ​ | ​ | 1,116 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,116
Issuance of common stock upon exercise of common stock warrants | ​ | 10 | ​ | ​ | — | ​ | ​ | 67 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 67
Issuance of common stock upon release of restricted stock units ("RSUs") |  | 2,150 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
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
Capitalization of offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (888) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (888)
Stock-based compensation |  | — | ​ | ​ | — |  | ​ | 3,554 |  |  | — |  |  | — |  |  | 3,554
Foreign currency translation gain |  | — |  |  | — |  |  | — |  |  | 156 | ​ |  | — |  |  | 156
Change in unrealized gain on available-for-sale securities |  | — |  |  | — |  |  | — |  |  | 65 |  |  | — |  |  | 65
Net loss |  | — |  |  | — |  |  | — |  |  | — |  |  | (39,654) |  |  | (39,654)
Balance, June 30, 2025 |  | 323,762 | ​ | $ | 32 | ​ | $ | 1,104,880 | ​ | $ | 133 | ​ | $ | (551,782) | ​ | $ | 553,263
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | 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 | ​ | 1,595 | ​ | ​ | — | ​ | ​ | 1,443 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,443
Issuance of common stock upon exercise of common stock warrants | ​ | 56 | ​ | ​ | — | ​ | ​ | 733 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 733
Issuance of common stock upon release of RSUs |  | 5,234 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | —
Proceeds from sale of common stock from Quanta private placement transaction | ​ | 3,020 | ​ | ​ | — | ​ | ​ | 35,000 | ​ | ​ | — |  |  | — | ​ | ​ | 35,000
Proceeds from sale of common stock through ATM Offering | ​ | 30,310 | ​ | ​ | 3 | ​ | ​ | 346,716 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 346,719
Vesting of Promote Sponsor Vesting Shares | ​ | — | ​ | ​ | — | ​ | ​ | 32,946 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 32,946
Capitalization of offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (888) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (888)
Stock-based compensation |  | — | ​ | ​ | — |  | ​ | 7,728 |  |  | — |  |  | — |  |  | 7,728
Foreign currency translation loss |  | — |  |  | — |  |  | — |  |  | (29) | ​ |  | — |  |  | (29)
Change in unrealized gain on available-for-sale securities |  | — |  |  | — |  |  | — |  |  | 57 |  |  | — |  |  | 57
Net income |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,965 |  |  | 2,965
Balance, June 30, 2025 |  | 323,762 | ​ | $ | 32 | ​ | $ | 1,104,880 | ​ | $ | 133 | ​ | $ | (551,782) | ​ | $ | 553,263
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | Accumulated |  | ​ | ​ |  |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Additional | ​ | Other | ​ | ​ | ​ | ​ | Total
​ | ​ | Common Stock | ​ | Paid-In | ​ | Comprehensive | ​ | Accumulated | ​ | Stockholders’
​ | ​ | Shares |  | Amount | ​ | Capital | ​ | Income | ​ | Deficit | ​ | Equity
Balance, March 31, 2024 |  | 165,311 | ​ | $ | 16 | ​ | $ | 489,955 | ​ | $ | 138 | ​ | $ | (374,532) | ​ | $ | 115,577
Issuance of common stock upon exercise of stock options | ​ | 31 | ​ | ​ | — | ​ | ​ | 8 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8
Issuance of common stock upon release of RSUs | ​ | 1,478 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Proceeds from sale of common stock through ATM Offering | ​ | 12,777 | ​ | ​ | 1 | ​ | ​ | 15,801 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,802
Capitalization of deferred offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (80) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (80)
Stock-based compensation | ​ | — | ​ | ​ | — | ​ | ​ | 3,287 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,287
Foreign currency translation loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (17) | ​ | ​ | — | ​ | ​ | (17)
Change in unrealized loss on available-for-sale securities | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2 | ​ | ​ | — | ​ | ​ | 2
Net loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (12,421) | ​ | ​ | (12,421)
Balance, June 30, 2024 |  | 179,597 | ​ | $ | 17 | ​ | $ | 508,971 | ​ | $ | 123 | ​ | $ | (386,953) | ​ | $ | 122,158
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  |  | ​ |  |  | ​ |  | 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 | ​ | 250 | ​ | ​ | — | ​ | ​ | 68 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 68
Issuance of common stock upon release of RSUs | ​ | 2,801 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
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 | ​ | 19,423 | ​ | ​ | 2 | ​ | ​ | 26,831 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 26,833
Capitalization of deferred offering costs to equity upon share issuance | ​ | — | ​ | ​ | — | ​ | ​ | (132) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (132)
Stock-based compensation | ​ | — | ​ | ​ | — | ​ | ​ | 6,278 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,278
Foreign currency translation loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (105) | ​ | ​ | — | ​ | ​ | (105)
Change in unrealized loss on available-for-sale securities | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (16) | ​ | ​ | — | ​ | ​ | (16)
Net loss | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (33,194) | ​ | ​ | (33,194)
Balance, June 30, 2024 |  | 179,597 | ​ | $ | 17 | ​ | $ | 508,971 | ​ | $ | 123 | ​ | $ | (386,953) | ​ | $ | 122,158
​

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