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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Summary of Common Stock Shares Activity | The following table summarizes common stock share activity for the three and six months ended June 30, 2023 and 2022 (dollars in thousands):
|  | Three Months Ended June 30, 2023 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ (Deficit) Equity |
Balance, March 31, 2023 |  |  | 33,327,627 |  |  | $ | 36 |  |  | $ | 426,214 |  |  | $ | (456,164 | ) |  | $ | (29,914 | )
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 122,260 |  |  |  | 122,260 |
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 728 |  |  |  | — |  |  |  | 728 |
Common stock issued, net of expenses |  |  | 3,787,400 |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 4 |
Common stock issued for vested restricted stock units |  |  | 60,638 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance, June 30, 2023 |  |  | 37,175,665 |  |  | $ | 40 |  |  | $ | 426,942 |  |  | $ | (333,904 | ) |  | $ | 93,078 |
|  | Three Months Ended June 30, 2022 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, March 31, 2022 |  |  | 29,221,158 |  |  | $ | 32 |  |  | $ | 403,825 |  |  | $ | (364,930 | ) |  | $ | 38,927 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (13,345 | ) |  |  | (13,345 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 1,100 |  |  |  | — |  |  |  | 1,100 |
Common stock issued, net of expenses |  |  | 3,358,333 |  |  |  | 4 |  |  |  | 18,794 |  |  |  | — |  |  |  | 18,798 |
Common stock issued for vested restricted stock units |  |  | 16,912 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance, June 30, 2022 |  |  | 32,596,403 |  |  | $ | 36 |  |  | $ | 423,719 |  |  | $ | (378,275 | ) |  | $ | 45,480 |
|  | Six Months Ended June 30, 2023 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, December 31, 2022 |  |  | 32,682,342 |  |  | $ | 36 |  |  | $ | 425,485 |  |  | $ | (422,288 | ) |  | $ | 3,233 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 88,384 |  |  |  | 88,384 |
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 1,435 |  |  |  | — |  |  |  | 1,435 |
Common stock issued through employee stock purchase plan |  |  | 2,662 |  |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | 4 |
Common stock issued, net of expenses |  |  | 4,150,400 |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 4 |
Common stock issued for vested restricted stock units |  |  | 340,261 |  |  |  | — |  |  |  | 18 |  |  |  | — |  |  |  | 18 |
Balance, June 30, 2023 |  |  | 37,175,665 |  |  | $ | 40 |  |  | $ | 426,942 |  |  | $ | (333,904 | ) |  | $ | 93,078 |
|  | Six Months Ended June 30, 2022 |
|  | Shares of Common Stock |  |  | Common Stock |  |  | Additional Paid-in Capital |  |  | Accumulated Deficit |  |  | Total Stockholders’ Equity |
Balance, December 31, 2021 |  |  | 28,705,334 |  |  | $ | 32 |  |  | $ | 400,705 |  |  | $ | (359,479 | ) |  | $ | 41,258 |
Net loss |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (18,796 | ) |  |  | (18,796 | )
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 2,022 |  |  |  | — |  |  |  | 2,022 |
Common stock issued through employee stock purchase plan |  |  | 3,120 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |
Common stock issued, net of expenses |  |  | 3,845,943 |  |  |  | 4 |  |  |  | 20,911 |  |  |  | — |  |  |  | 20,915 |
Common stock issued for vested restricted stock units |  |  | 42,006 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Vested Loan Agreement warrants |  |  | — |  |  |  | — |  |  |  | 71 |  |  |  | — |  |  |  | 71 |
Balance, June 30, 2022 |  |  | 32,596,403 |  |  | $ | 36 |  |  | $ | 423,719 |  |  | $ | (378,275 | ) |  | $ | 45,480 |
Common Stock Reserved For Future Issuances | The Company had reserved shares of common stock for future issuance as follows:
|  | June 30, 2023 |  |  | December 31, 2022 |
Outstanding stock options |  |  | 1,970,536 |  |  |  | 1,740,308 |
Outstanding restricted stock units |  |  | 2,194,251 |  |  |  | 633,270 |
Warrants to purchase common stock associated with March 2018 public offering – Series 2 |  |  | — |  |  |  | 798,810 |
Warrants to purchase common stock associated with December 2020 public offering - Series 2 |  |  | 6,800,000 |  |  |  | 6,800,000 |
Prefunded warrants to purchase common stock associated with December 2020 public offering |  |  | 3,200,000 |  |  |  | 3,200,000 |
Warrants to purchase common stock associated with April 2022 Public Offering |  |  | 15,000,000 |  |  |  | 15,000,000 |
Prefunded warrants to purchase common stock associated with April 2022 Public Offering |  |  | 7,516,267 |  |  |  | 11,666,667 |
Warrants to purchase common stock associated with Loan Agreement |  |  | 198,811 |  |  |  | 198,811 |
Warrant to purchase common stock associated with Danforth |  |  | 50,000 |  |  |  | 50,000 |
For possible future issuance for the conversion of the March 2019 Notes |  |  | 1,138,200 |  |  |  | 1,138,200 |
For possible future issuance under 2014 Plan (Note 10) |  |  | 504,074 |  |  |  | 712,020 |
For possible future issuance under employee stock purchase plan |  |  | 279 |  |  |  | — |
For possible future issuance under 2015 Plan (Note 10) |  |  | 572,975 |  |  |  | 550,964 |
Total common shares reserved for future issuance |  |  | 39,145,393 |  |  |  | 42,489,050 |

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