Warrants to Purchase Common Stock	12 Months Ended
Dec. 31, 2022
Warrants to Purchase Common Stock [Abstract]
Warrants to Purchase Common Stock	6. Warrants to Purchase Common Stock On June 19, 2013, the Company issued a warrant to purchase up to an aggregate of 1,238 shares of common stock at an exercise price of $484.80 per share. The warrant expires on the tenth anniversary of its issuance date. As of December 31, 2022, these warrants were fully vested and unexercised. On June 30, 2016, the Company and Savant Neglected Diseases, LLC (“Savant”) entered into an Agreement for the Manufacture, Development and Commercialization of Benznidazole for Human Use (the “MDC Agreement”), pursuant to which the Company acquired certain worldwide rights relating to benznidazole. In connection with the MDC Agreement, also on June 30, 2016, the Company issued to Savant a five-year warrant (the “Savant Warrant”) to purchase 40,000 shares of the Company’s Common Stock, at an exercise price of $11.25 per share, subject to adjustment. The Savant Warrant was exercisable for 25% of the shares immediately and exercisable for the remaining shares upon reaching certain regulatory related milestones. In addition, pursuant to the MDC Agreement, the Company had granted Savant certain “piggyback” registration rights for the shares issuable under the Savant Warrant. On June 30, 2020, Savant exercised 20,000 warrants in a cashless exercise resulting in 10,909 shares being issued to Savant in July 2020. The remaining unvested warrants for an aggregate of up to 20,000 shares expired on June 30, 2021. On May 20, 2020, in connection with manufacturing consulting services, the Company issued a warrant to purchase up to an aggregate of 30,000 shares of common stock at an exercise price of $4.30 per share. The warrants were fully vested on the date of issue and expire ten years from the issuance date. These warrants remained unexercised as of December 31, 2022.

Warrants to Purchase Common Stock

12 Months Ended

Dec. 31, 2022

Warrants to Purchase Common Stock [Abstract]

6. Warrants to Purchase Common Stock

On June 19, 2013, the Company issued a warrant to purchase up to an aggregate of 1,238 shares of common stock at an exercise price of $484.80 per share. The warrant expires on the tenth anniversary of its issuance date. As of December 31, 2022, these warrants were fully vested and unexercised.

On June 30, 2016, the Company and Savant Neglected Diseases, LLC (“Savant”) entered into an Agreement for the Manufacture, Development and Commercialization of Benznidazole for Human Use (the “MDC Agreement”), pursuant to which the Company acquired certain worldwide rights relating to benznidazole. In connection with the MDC Agreement, also on June 30, 2016, the Company issued to Savant a five-year warrant (the “Savant Warrant”) to purchase 40,000 shares of the Company’s Common Stock, at an exercise price of $11.25 per share, subject to adjustment. The Savant Warrant was exercisable for 25% of the shares immediately and exercisable for the remaining shares upon reaching certain regulatory related milestones. In addition, pursuant to the MDC Agreement, the Company had granted Savant certain “piggyback” registration rights for the shares issuable under the Savant Warrant. On June 30, 2020, Savant exercised 20,000 warrants in a cashless exercise resulting in 10,909 shares being issued to Savant in July 2020. The remaining unvested warrants for an aggregate of up to 20,000 shares expired on June 30, 2021.

On May 20, 2020, in connection with manufacturing consulting services, the Company issued a warrant to purchase up to an aggregate of 30,000 shares of common stock at an exercise price of $4.30 per share. The warrants were fully vested on the date of issue and expire ten years from the issuance date. These warrants remained unexercised as of December 31, 2022.