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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2020
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 nine-month period ended September 30, 2020 (unaudited):
|  | Number of shares |
Available for grant at December 31, 2019 |  |  | 426,022 |
Added to 2019 Share Incentive Plan |  |  | 1,283,649 |
RSUs granted |  |  | (506,500 | )
Options granted |  |  | (560,000 | )
Shares withheld in settlement of taxes |  |  | 10,341 |
Forfeitures |  |  | 160,250 |
Available for grant at September 30, 2020 |  |  | 813,762 |
Schedule of Total Share Based Compensation Expense | The following table shows total share-based compensation expense for the three-month and nine-month periods ended September 30, 2019 and 2020 (unaudited and in thousands):
|  | Three Months Ended September 30 |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |
Cost of revenues |  | $ | 14 |  |  | $ | 16 |  |  | $ | 196 |  |  | $ | 51 |
Research and development |  |  | 199 |  |  |  | 396 |  |  |  | 5,062 |  |  |  | 1,186 |
Sales and marketing |  |  | 374 |  |  |  | 251 |  |  |  | 3,981 |  |  |  | 726 |
General and administrative |  |  | 241 |  |  |  | 291 |  |  |  | 7,667 |  |  |  | 742 |
Total share-based compensation expense |  | $ | 828 |  |  | $ | 954 |  |  | $ | 16,906 |  |  | $ | 2,705 |
Summary of Stock Option Activity | The following is a summary of option activity for the Company’s share incentive plans for the nine-month period ended September 30, 2020 (unaudited):
|  | Options |  |  | Weighted average exercise price |  |  | Weighted Average remaining contractual term (years) |  |  | Aggregate intrinsic value |
Outstanding at December 31, 2019 |  |  | 2,920,500 |  |  | $ | 10.40 |  |  |  | 9.6 |  |  | $ | 1,932,000 |
Options granted |  |  | 560,000 |  |  | $ | 15.65 |  |  |  | — |  |  | $ | — |
Options exercised |  |  | (13,594 | ) |  | $ | 12.00 |  |  |  | — |  |  | $ | — |
Options forfeited |  |  | (160,250 | ) |  | $ | 10.76 |  |  |  | — |  |  | $ | — |
Outstanding at September 30, 2020 |  |  | 3,306,656 |  |  | $ | 11.26 |  |  |  | 9.1 |  |  | $ | 18,548,215 |
Options exercisable at September 30, 2020 |  |  | 696,461 |  |  | $ | 11.97 |  |  |  | 8.7 |  |  | $ | 3,416,065 |
Options vested and expected to vest at September 30, 2020 |  |  | 3,119,588 |  |  | $ | 11.24 |  |  |  | 9.1 |  |  | $ | 17,576,131 |
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):
|  | For the nine months ended September 30, |
|  | 2019 |  |  | 2020 |
Expected dividend yield |  |  | — |  |  |  | — |
Risk-free interest rate |  |  | 1.82 | % |  |  | 0.39 | %
Weighted-average expected volatility |  |  | 40.8 | % |  |  | 50.0 | %
Expected term (in years) |  |  | 6.0 |  |  |  | 6.5 |
Weighted average grant-date fair value per share of options granted |  | $ | 5.00 |  |  | $ | 7.56 |
Summary of Restricted Shares Activity | The following is a summary of restricted shares activity for the Company’s share incentive plans for the nine-month period ended September 30, 2020 (unaudited):
|  | Units |  |  | Weighted average grant date fair value |
RSU and RSA balance at December 31, 2019 |  |  | 257,119 |  |  | $ | 12.00 |
RSUs and RSAs granted |  |  | 506,500 |  |  | $ | 4.56 |
RSUs and RSAs vested |  |  | (18,055 | ) |  | $ | 12.00 |
RSUs and RSAs forfeited |  |  | (5,078 | ) |  | $ | 12.00 |
RSU and RSA balance at September 30, 2020 |  |  | 740,486 |  |  | $ | 6.91 |
RSUs and RSAs expected to vest at September 30, 2020 |  |  | 740,486 |  |  | $ | 6.91 |

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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=115993241&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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