Employee Stock Purchase Plan	6 Months Ended
Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Employee Stock Purchase Plan	9. Employee Stock Purchase Plan In March 2017, the Board of Directors adopted and the stockholders approved the Employee Stock Purchase Plan that became effective in April 2017. On June 20, 2018, the Company’s stockholders approved the Amended and Restated 2017 Employee Stock Purchase Plan (the “ESPP”) at the 2018 annual meeting of stockholders. Pursuant to the terms of the ESPP, the Company will reserve for issuance 300,000 shares of the Company’s common stock in the aggregate, plus, on January 1, 2019 and each January 1 thereafter through January 1, 2028, the number of shares of the Company’s common stock reserved and available for issuance under the ESPP will be cumulatively increased by the least of (i) one percent of the number of shares of the Company’s common stock issued and outstanding on the immediately preceding December 31; (ii) 350,000 shares; or (iii) such lesser number of shares of the Company’s common stock as determined by the Board of Directors, in each case subject to adjustment in accordance with the terms of the ESPP. In January 2021, the Company’s Board of Directors approved an increase of 350,000 shares to the ESPP, which increase was effective as of January 1, 2021. No shares under the ESPP are outstanding at June 30, 2021 and December 31, 2020.

Employee Stock Purchase Plan

6 Months Ended

Jun. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

9. Employee Stock Purchase Plan

In March 2017, the Board of Directors adopted and the stockholders approved the Employee Stock Purchase Plan that became effective in April 2017. On June 20, 2018, the Company’s stockholders approved the Amended and Restated 2017 Employee Stock Purchase Plan (the “ESPP”) at the 2018 annual meeting of stockholders. Pursuant to the terms of the ESPP, the Company will reserve for issuance 300,000 shares of the Company’s common stock in the aggregate, plus, on January 1, 2019 and each January 1 thereafter through January 1, 2028, the number of shares of the Company’s common stock reserved and available for issuance under the ESPP will be cumulatively increased by the least of (i) one percent of the number of shares of the Company’s common stock issued and outstanding on the immediately preceding December 31; (ii) 350,000 shares; or (iii) such lesser number of shares of the Company’s common stock as determined by the Board of Directors, in each case subject to adjustment in accordance with the terms of the ESPP. In January 2021, the Company’s Board of Directors approved an increase of 350,000 shares to the ESPP, which increase was effective as of January 1, 2021. No shares under the ESPP are outstanding at June 30, 2021 and December 31, 2020.