Subsequent events	3 Months Ended
Mar. 31, 2021
Subsequent events
Subsequent events	(16) Subsequent events The Company has evaluated subsequent events from the Consolidated Balance Sheet date through May 19, 2021, which is the date the consolidated financial statements were issued. (a)Increase in shares available for issuance under the 2015 Plan In February 2021, the board of directors approved and in April 2021, its stockholders approved the number of shares of common stock authorized for issuance under the 2015 Plan to be increased from 4,947,214 shares to 6,020,175 shares (an increase by 1,072,961 shares). (b)Reverse stock split and conversion of Class B common stock to Class A common stock On April 8, 2021, the Board of Directors of the Company approved a 1‑for‑2.33 reverse stock split of its issued and outstanding common stock and a proportional adjustment to the existing conversion ratios for each series of the Company’s convertible preferred stock, which was effected on April 9, 2021. All issued and outstanding shares of common stock and related per share amounts contained in the accompanying consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented. The par value of the authorized stock was not adjusted as a result of the reverse stock split. Other than the par value, all share and per share data shown in the accompanying financial statements and related notes have been retroactively revised to reflect the reverse stock split and adjustment of the Preferred Stock conversion ratios. On April 8, 2021, the Board of Directors approved the conversion of all outstanding shares of the Company’s Class B common stock on a 1 for 1 basis into 2,563,765 shares of the Company’s Class A common stock, which will be effected upon the completion of the proposed IPO. (c)Approval of the 2021 Equity Incentive Plan On March 24, 2021, the Company’s board of directors and on April 8, 2021, its stockholders approved and adopted the 2021 Equity Incentive Award Plan (the “2021 Plan”). The 2021 Plan will become effective immediately prior to and contingent upon the closing of the IPO. Under the 2021 Plan, the Company may grant stock options, stock appreciation rights, restricted stock, restricted stock units, and other stock or cash-based awards to individuals who are then employees, officers, directors or consultants of the Company. A total of 1,727,953 shares of common stock were approved to be initially reserved for issuance under the 2021 Plan. The number of shares under the 2015 Plan subject to outstanding awards as of the effective date of the 2021 Plan that are subsequently canceled, forfeited or repurchased by the Company will be added to the shares reserved under the 2021 Plan. In addition, the number of shares of common stock available for issuance under the 2021 Plan will be automatically increased on the first day of each calendar year during the ten-year term of the 2021 Plan, beginning with January 1, 2022 and ending with January 1, 2030, by an amount equal to 5% of the outstanding number of shares of the Company’s common stock on December 31st of the preceding calendar year or such lesser amount as determined by the Company’s board of directors. (d)Approval of the 2021 Employee Stock Purchase Plan On March 24, 2021, the Company’s board of directors and on April 8, 2021, its stockholders approved and adopted the 2021 Employee stock Purchase Plan (the “ESPP”). The ESPP will become effective on immediately prior to and contingent upon the closing of the IPO. The ESPP permits participants to purchase common stock through payroll deductions of up to 15% of their eligible compensation. A total of 172,795 shares of common stock were approved to be initially reserved for issuance under the ESPP. In addition, the number of shares of common stock available for issuance under the ESPP will be automatically increased on the first day of each calendar year during the first ten-years of the term of the ESPP, beginning with January 1, 2022 and ending with January 1, 2030, by an amount equal to 0.5% of the outstanding number of shares of the Company’s common stock on December 31st of the preceding calendar year or such lesser amount as determined by the Company’s board of directors. (e)Initial Public Offering On April 20, 2021, the Company completed the initial public offering of its common stock (the “IPO”). In the IPO, the Company issued and sold 7,567,000 shares of its common stock at a price to the public of $20.00 per share, including the exercise by the underwriters of their option to purchase an additional 987,000 shares. In connection with the IPO, on April 20, 2021 all preferred stock converted into 26,545,579 shares of common stock, and all outstanding shares of our Class B common stock converted on a 1 for 1 basis into 2,563,765 shares of our common stock. On April 20, 2021, in connection with the closing of the IPO, the Company’s amended and restated certificate of incorporation, as filed with the Secretary of State of the State of Delaware, and the Company’s amended and restated bylaws became effective.

(16) Subsequent events

The Company has evaluated subsequent events from the Consolidated Balance Sheet date through May 19, 2021, which is the date the consolidated financial statements were issued.

(a)Increase in shares available for issuance under the 2015 Plan

In February 2021, the board of directors approved and in April 2021, its stockholders approved the number of shares of common stock authorized for issuance under the 2015 Plan to be increased from 4,947,214 shares to 6,020,175 shares (an increase by 1,072,961 shares).

(b)Reverse stock split and conversion of Class B common stock to Class A common stock

On April 8, 2021, the Board of Directors of the Company approved a 1‑for‑2.33 reverse stock split of its issued and outstanding common stock and a proportional adjustment to the existing conversion ratios for each series of the Company’s convertible preferred stock, which was effected on April 9, 2021. All issued and outstanding shares of common stock and related per share amounts contained in the accompanying consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented. The par value of the authorized stock was not adjusted as a result of the reverse stock split. Other than the par value, all share and per share data shown in the accompanying financial statements and related notes have been retroactively revised to reflect the reverse stock split and adjustment of the Preferred Stock conversion ratios. On April 8, 2021, the Board of Directors approved the conversion of all outstanding shares of the Company’s Class B common stock on a 1 for 1 basis into 2,563,765 shares of the Company’s Class A common stock, which will be effected upon the completion of the proposed IPO.

(c)Approval of the 2021 Equity Incentive Plan

On March 24, 2021, the Company’s board of directors and on April 8, 2021, its stockholders approved and adopted the 2021 Equity Incentive Award Plan (the “2021 Plan”). The 2021 Plan will become effective immediately prior to and contingent upon the closing of the IPO. Under the 2021 Plan, the Company may grant stock options, stock appreciation rights, restricted stock, restricted stock units, and other stock or cash-based awards to individuals who are then employees, officers, directors or consultants of the Company. A total of 1,727,953 shares of common stock were approved to be initially reserved for issuance under the 2021 Plan. The number of shares under the 2015 Plan subject to outstanding awards as of the effective date of the 2021 Plan that are subsequently canceled, forfeited or repurchased by the Company will be added to the shares reserved under the 2021 Plan. In addition, the number of shares of common stock available for issuance under the 2021 Plan will be automatically increased on the first day of each calendar year during the ten-year term of the 2021 Plan, beginning with January 1, 2022 and ending with January 1, 2030, by an amount equal to 5% of the outstanding number of shares of the Company’s common stock on December 31st of the preceding calendar year or such lesser amount as determined by the Company’s board of directors.

(d)Approval of the 2021 Employee Stock Purchase Plan

On March 24, 2021, the Company’s board of directors and on April 8, 2021, its stockholders approved and adopted the 2021 Employee stock Purchase Plan (the “ESPP”). The ESPP will become effective on immediately prior to and contingent upon the closing of the IPO. The ESPP permits participants to purchase common stock through payroll deductions of up to 15% of their eligible compensation. A total of 172,795 shares of common stock were approved to be initially reserved for issuance under the ESPP. In addition, the number of shares of common stock available for issuance under the ESPP will be automatically increased on the first day of each calendar year during the first ten-years of the term of the ESPP, beginning with January 1, 2022 and ending with January 1, 2030, by an amount equal to 0.5% of the outstanding number of shares of the Company’s common stock on December 31st of the preceding calendar year or such lesser amount as determined by the Company’s board of directors.

(e)Initial Public Offering

On April 20, 2021, the Company completed the initial public offering of its common stock (the “IPO”). In the IPO, the Company issued and sold 7,567,000 shares of its common stock at a price to the public of $20.00 per share, including the exercise by the underwriters of their option to purchase an additional 987,000 shares. In connection with the IPO, on April 20, 2021 all preferred stock converted into 26,545,579 shares of common stock, and all outstanding shares of our Class B common stock converted on a 1 for 1 basis into 2,563,765 shares of our common stock.

On April 20, 2021, in connection with the closing of the IPO, the Company’s amended and restated certificate of incorporation, as filed with the Secretary of State of the State of Delaware, and the Company’s amended and restated bylaws became effective.