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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Changes in Number of Shares Available for Grant | The following table summarizes changes in the number of shares available for grant under the Company’s equity incentive plans during the three-month period ended March 31, 2022 (unaudited):
|  | Number of shares |
Available for grant at December 31, 2021 |  |  | 1,853,240 |
Added to 2019 Share Incentive Plan |  |  | 1,320,000 |
RSUs granted |  |  | (8,606 | )
Options granted |  |  | — |
Shares withheld in settlement of taxes and/or exercise price |  |  | 18,200 |
Forfeitures |  |  | 4,916 |
Available for grant at March 31, 2022 |  |  | 3,187,750 |
Schedule of Total Share Based Compensation Expense | The following table shows total share-based compensation expense for the three-month periods ended March 31, 2021 and 2022 (unaudited and in thousands):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2022 |
Cost of revenues |  | $ | 19 |  |  | $ | 57 |
Research and development |  |  | 517 |  |  |  | 1,022 |
Sales and marketing |  |  | 295 |  |  |  | 627 |
General and administrative |  |  | 579 |  |  |  | 714 |
Total share-based compensation expense |  | $ | 1,410 |  |  | $ | 2,420 |
Summary of Stock Option Activity | The following is a summary of option activity for the Company’s share incentive plans for the three-month period ended March 31, 2022 (unaudited):
|  | Options |  |  | Weighted average exercise price |  |  | Weighted Average remaining contractual term (years) |  |  | Aggregate intrinsic value |
Outstanding at December 31, 2021 |  |  | 2,797,992 |  |  | $ | 12.64 |  |  |  | 7.9 |  |  | $ | 38,295,799 |
Options granted |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Options exercised |  |  | (14,268 | ) |  | $ | 10.23 |  |  |  | — |  |  | $ | — |
Options forfeited |  |  | (750 | ) |  | $ | 12.00 |  |  |  | — |  |  | $ | — |
Outstanding at March 31, 2022 |  |  | 2,782,974 |  |  | $ | 12.66 |  |  |  | 7.7 |  |  | $ | 32,758,640 |
Options exercisable at March 31, 2022 |  |  | 1,505,502 |  |  | $ | 11.88 |  |  |  | 7.6 |  |  | $ | 18,253,275 |
Options vested and expected to vest at March 31, 2022 |  |  | 2,740,776 |  |  | $ | 12.64 |  |  |  | 7.7 |  |  | $ | 32,237,845 |
Schedule of Estimated Fair Value of Weighted Average Assumptions | The fair value of options granted are estimated on the date of grant using the Black-Scholes option pricing model. The fair value of share options is being amortized on a straight-line basis over the requisite service period of the awards. The fair value of share options is estimated using the following weighted-average assumptions (unaudited):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2022 |
Expected dividend yield |  |  | — |  |  |  | — |
Risk-free interest rate |  |  | 1.14 | % |  | N/A |
Weighted-average expected volatility |  |  | 50.9 | % |  | N/A |
Expected term (in years) |  |  | 6.5 |  |  | N/A |
Weighted average grant-date fair value per share of options granted |  | $ | 21.36 |  |  | N/A |
Summary of Restricted Shares Activity | The following is a summary of restricted shares activity for the Company’s share incentive plan for the three-month period ended March 31, 2022 (unaudited):
|  | Units |  |  | Weighted average grant date fair value |
RSU balance at December 31, 2021 |  |  | 547,343 |  |  | $ | 22.47 |
RSUs granted |  |  | 8,606 |  |  | $ | 23.80 |
RSUs vested |  |  | (93,854 | ) |  | $ | 28.98 |
RSUs forfeited |  |  | (4,166 | ) |  | $ | 40.25 |
RSU balance at March 31, 2022 |  |  | 457,929 |  |  | $ | 21.00 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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