8. Stockholders' Equity |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2021 | |||
| Equity [Abstract] | |||
| Stockholders' Equity |
Warrants
In connection with certain of the Company’s collaboration agreements and consulting arrangements, the Company has issued warrants to purchase shares of common stock as payment for services. As of March 31, 2021 and December 31, 2020, collaboration warrants to purchase 30,307 shares of common stock were outstanding. The outstanding warrants as of March 31, 2021 have an average weighted exercise price of $124.74 per share and expiration dates ranging from April 2021 through May 2021. No collaboration warrants were granted or exercised and none expired in connection with collaboration or consulting services during the three months ended March 31, 2021 and 2020, respectively.
In addition, the Company has outstanding warrants to purchase an aggregate of 347,505 and 378,453 shares of common stock in connection with debt and equity financing arrangements as of March 31, 2021 and December 31, 2020, respectively. As of March 31, 2021, these warrants have an average weighted exercise price of $36.74 per share and expiration dates ranging from July 2021 through September 2026. No debt and equity financing warrants were granted during the three months ended March 31, 2021 and 2020. During the three months ended March 31, 2021 and 2020, debt and equity financing warrants to purchase approximately 1,485 and 0.2 million shares of common stock, respectively, were exercised on a cashless one-for-one basis. In addition, approximately 29,000 debt and equity warrants expired during the three months ended March 31, 2021. No debt and equity warrants expired during the three months ended March 31, 2020. |