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401(k) Plan and ESPP
 12 Months Ended
Dec. 31, 2020
Retirement Benefits [Abstract]  
401(k) Plan and ESPP

13. 401(k) Plan and ESPP

The Company sponsors a 401(k) defined contribution plan covering all employees and began employer contributions in 2018. The Company incurred expenses of $0.5 million, $0.4 million, and $0.3 million for the years ended December 31, 2020, 2019, and 2018 respectively.

In October 2019, the Board of Directors and stockholders also adopted and approved the 2019 Employee Stock Purchase Plan (the “ESPP”).  Following the IPO, the ESPP authorized the issuance of 1,700,000 shares of common stock to purchase rights granted to our employees or to employees of our designated affiliates. As of December 31, 2020, 1,596,323 shares of common stock remained available to be issued under the ESPP. The first purchase period commenced on October 25, 2019 and ended on July 31, 2020 with proceeds of $1.1 million used for the purchase of shares of common stock. The second purchase period commenced on August 1, 2020 and ended on January 31, 2021.