The Company also excluded the shares issuable upon conversion of the 2026 Convertible notes from the computation of diluted net loss per share for the nine months ended September 30, 2020 because they had an anti-dilutive impact.
13. Stock-Based Awards
2014 Stock Incentive Plan
The 2014 Stock Incentive Plan (the “2014 Plan”) provides for the grant of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units, stock appreciation rights and other stock-based awards. The number of shares of common stock that may be issued under the 2014 Plan is subject to increase on the first day of each fiscal year, beginning on January 1, 2015 and ending on December 31, 2024 in an amount equal to the lesser of a pre-determined formula or an amount determined by the Company’s board of directors. On January 1, 2021, the number of shares available for issuance under the 2014 Plan was increased by 1,659,218. During the three months ended September 30, 2021, the Company did 0t grant options under the 2014 Plan. During the nine months ended September 30, 2021, the Company granted options under the 2014 Plan to purchase 2,709,019 shares of common stock, at a weighted exercise price of $18.19 per share.
On June 18, 2021, the Company’s stockholders approved the adoption of the 2021 Stock Incentive Plan (the “2021 Plan”) previously approved by the board of directors. Effective as of the adoption of the 2021 Plan by the Company’s stockholders, no new awards will be granted under the 2014 Plan. However, as of September 30, 2021, all then-outstanding awards under the 2014 Plan remained in effect and continued to be governed by the terms of the 2014 Plan.
2021 Stock Incentive Plan
The 2021 Plan provides for the grant of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units, stock appreciation rights and other stock-based awards. The number of shares of common stock that may be issued under the 2021 Plan is 6,000,000 shares of common stock; plus 456,334 shares remaining available for grant under the 2014 Plan as of immediately prior to the effective date of the 2021 Plan and 9,766,336 shares subject to awards granted under the 2014 Plan or the Company’s 2006 Stock Incentive Plan, which awards expire, terminate or are otherwise surrendered, canceled, forfeited or repurchased by the Company at their original issuance price pursuant to a contractual repurchase right (subject to certain limitations). During the three and nine months ended September 30, 2021, the Company granted options to purchase 214,555 and 322,555 shares of common stock, at a weighted exercise price of $11.48 and $12.16 per share, respectively.
2014 Employee Stock Purchase Plan
The Company has a 2014 Employee Stock Purchase Plan (the “ESPP”). The number of shares of common stock that may be issued under the ESPP will automatically increase on the first day of each fiscal year, commencing on January 1, 2015 and ending on December 31, 2024 in an amount equal to the lesser of a pre-determined formula or as determined by the Company’s board of directors. On January 1, 2021, the number of shares available for issuance under the 2014 Plan was increased by 207,402. During the three and nine months ended September 30, 2021, 0 and 40,631 shares of common stock were issued under the ESPP. As of September 30, 2021, 690,965 shares remained available for issuance under the ESPP.
Inducement Stock Option Awards
On October 29, 2019, the 2019 Inducement Stock Incentive Plan (the “Inducement Plan”) was approved by the Board of Directors of the Company. Initially, the maximum number of shares of common stock issuable under the Inducement Plan was 500,000. On December 10, 2020, the Board of Directors of the Company amended the 2019 Inducement Plan to increase the aggregate number of shares issuable from 500,000 to 1,054,000 shares of common stock. As of September 30, 2021, 507,376 shares of common stock remained available for issuance under the Inducement Plan.