On March 5, 2015, the Board of Directors of the Company approved an Equity Incentive Plan (the “2015 Plan”) which is administered by the Board of Directors. Under the 2015 Plan, the Board of Directors may grant options to purchase ordinary shares to management including officers, directors, employees and individual advisors who render services to the Group to purchase an aggregate of no more than 4,140,945 ordinary shares of the Group (“Option Pool”). Subsequently, the Board of Directors approved the increase in the Option Pool to 7,369,767 ordinary shares.

In connection with the completion of the initial public offering (the “IPO”), the Board of Directors approved the 2017 Equity Incentive Plan (the “2017 Plan”) and all equity-based awards subsequent to the IPO would be granted under the 2017 Plan.

For the nine months ended September 30, 2020, the Group granted 1,059,431 share options to certain management, employees and individual advisors of the Group at the exercise price ranging from $44.94 to $82.50 per share under the 2017 Plan. These options granted have a contractual term of ten years and generally vest over a five- or three-year period, with 20% or 33.3% of the awards vesting beginning on the anniversary date one year after the grant date.

For the nine months ended September 30, 2021, the Group granted 553,198 share options to certain management and employees of the Group at the exercise price ranging from $130.96 to $180.00 per share under the 2017 Plan. These options granted have a contractual term of ten years and generally vest over a five-year period, with 20% of the awards vesting beginning on the anniversary date one year after the grant date.

The weighted-average grant-date fair value of the options granted in the nine months ended September 30, 2021 and 2020 were $82.21and $34.91 per share, respectively. The Group recorded compensation expense related to the options of $ 19,951 and $ 15,718 for the nine months ended September 30, 2021 and 2020, respectively, which were classified in the accompanying unaudited condensed consolidated statements of operations as follows:

As of September 30, 2021, there was $ 93,248 of total unrecognized compensation expense related to unvested share options granted. That cost is expected to be recognized over a weighted-average period of 1.39 years which is determined based on the number of shares and unrecognized years.

For the nine months ended September 30, 2020, 50,000 ordinary shares were authorized for grant to the independent directors. The restricted shares will vest and be released from the restrictions in full on the first anniversary from the date of the agreement. Upon termination of the independent directors’ service with the Group for any reason, any shares that are outstanding and not yet vested will be immediately forfeited.

For the nine months ended September 30, 2020, 71,250 ordinary shares were authorized for grant to certain management. One fifth of the restricted shares will vest and be released from the restrictions on each yearly anniversary from the date of the agreement. Upon termination of the certain management’s service with the Group for any reason, any shares that are outstanding and not yet vested will be immediately forfeited.

For the nine months ended September 30, 2021, 19,260 ordinary shares were authorized for grant to the independent directors. The restricted shares will vest and be released from the restrictions in full on the first anniversary from the date of the agreement. Upon termination of the independent directors’ service with the Group for any reason, any shares that are outstanding and not yet vested will be immediately forfeited.

For the nine months ended September 30, 2021, 271,509 ordinary shares were authorized for grant to certain management. One fifth of the restricted shares will vest and be released from the restrictions on each yearly anniversary from the date of the agreement. Upon termination of the certain management’s service with the Group for any reason, any shares that are outstanding and not yet vested will be immediately forfeited.

The Group measured the fair value of the

non-vested

restricted shares as of respective grant dates and recognized the amount as compensation expense over the deemed service period using a graded vesting attribution model on a straight-line basis.

As of September 30, 2021, there was $46,885 of total unrecognized compensation expense related to

non-vested

restricted shares. The Group recorded compensation expense related to the restricted shares of $8,155 and $4,687 for the nine months ended September 30, 2021 and 2020, respectively, which were classified in the accompanying unaudited condensed consolidated statements of operations as follows: