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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Schedule of Reserved Shares of Common Stock for Future Issuance
The Company has reserved for future issuance the following number of shares of common stock:
 
 September 30, 2020December 31, 2019
Common stock options and RSUs outstanding (1)15,653,443 12,195,031 
Shares available for issuance under Akebia equity
   plans (2)		3,156,911 2,983,256 
Warrant to purchase common stock509,611 509,611 
Shares available for issuance under the ESPP (3)5,480,334 5,715,992 
Total24,800,299 21,403,890 
 
(1)Includes awards granted under the 2014 Plan and the Inducement Award Program and awards issued in connection with the Merger.
(2)On January 1, 2020, January 1, 2019 and January 1, 2018, the shares reserved for future grants under the 2014 Plan increased by 4,031,376, 3,801,198 and 1,575,329 shares, respectively, pursuant to the 2014 Plan Evergreen Provision. On December 12, 2018, the shares reserved for future grants under the 2014 Plan increased by 2,323,213 shares as a result of the Company’s addition of the Assumed Shares to the 2014 Plan. On January 30, 2019, the Company’s Board of Directors approved 3,150,000 shares for issuance as option awards in fiscal year 2019 under the Inducement Award Program.
(3)On June 6, 2019, the shares reserved for future issuance under the ESPP increased by 5,200,000 shares upon shareholder approval of the Amended and Restated 2014 Employee Stock Purchase Plan. On February 28, 2018 and February 28, 2017, the shares reserved for future issuance under the 2014 ESPP remained unchanged. There were no increases in the shares reserved for future issuance pursuant to the evergreen provision under the ESPP in 2017 and 2018 as the maximum aggregate number of shares available for purchase under the 2014 ESPP had reached its cap of 739,611 on February 28, 2016.
Schedule of Stock-Based Compensation Expense Classification Related to Share-Based Awards
The Company has classified its stock-based compensation expense related to share-based awards as follows:
 
 Three Months EndedNine Months Ended
 September 30, 2020September 30, 2019September 30, 2020September 30, 2019
 (in thousands)(in thousands)
Research and development$1,468 $556 $4,726 $2,118 
Selling, general and administrative5,124 2,057 13,646 4,873 
Total$6,592 $2,613 $18,372 $6,991 
Schedule of Compensation Expense by Type of Award
Compensation expense by type of award:
 
 Three Months EndedNine Months Ended
 September 30, 2020September 30, 2019September 30, 2020September 30, 2019
 (in thousands)(in thousands)
Stock options$2,322 $1,305 $6,305 $3,490 
Restricted stock units3,990 1,217 11,476 3,318 
Employee stock purchase plan280 91 591 183 
Total$6,592 $2,613 $18,372 $6,991