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Stock-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Stock-based compensation |
Schedule of assumptions used to determine the grant-date fair value of stock options | The following table presents, on a weighted average basis, the assumptions used in the Black-Scholes option-pricing model to determine the grant-date fair value of stock options granted to employees and directors:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, |  | ​ | Nine Months Ended September 30, |
​ |  | 2021 |  | 2020 |  |  | 2021 |  | 2020 |
Risk-free interest rate |  | 0.96 | % | 0.34 | % |  | 0.90 | % | 0.36 | %
Expected term (in years) |  | 5.8 |  | 6.0 | ​ |  | 6.0 |  | 6.0 | ​
Expected volatility |  | 43.7 | % | 90.4 | % |  | 51.5 | % | 90.3 | %
Expected dividend yield |  | 0 | % | 0 | % |  | 0 | % | 0 | %
Schedule of stock option activity | The following table summarizes the Company’s stock option activity since December 31, 2020 (in thousands, except for share and per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | average | ​ | ​
​ | ​ | Number of | ​ | average | ​ | remaining | ​ | Aggregate
​ |  | shares |  | exercise price |  | contractual term |  | intrinsic value
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in years) | ​ | ​ | ​
Outstanding as of December 31, 2020 |  | 3,604,584 | ​ | $ | 0.92 |  | 8.12 | ​ | $ | 4,272
Granted |  | 1,732,182 | ​ |  | 9.15 | ​ | ​ | ​ | ​ | ​
Exercised |  | (111,149) | ​ |  | 2.67 |  |  | ​ |  |
Expired |  | (34,447) | ​ |  | 1.00 |  |  | ​ |  |
Forfeited |  | (667,866) | ​ |  | 2.12 |  |  | ​ |  |
Outstanding as of September 30, 2021 |  | 4,523,304 | ​ | $ | 3.88 |  | 7.68 | ​ | $ | 66,231
Options vested and expected to vest as of September 30, 2021 |  | 4,523,304 | ​ | $ | 3.88 |  | 7.68 | ​ | $ | 66,231
Options exercisable as of September 30, 2021 |  | 2,134,381 | ​ | $ | 1.25 |  | 6.17 | ​ | $ | 36,777
Schedule of restricted stock activity | The following table summarizes the Company’s restricted stock activity since December 31, 2020 (in thousands except for share and per share data):
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | Number of | ​ | average
​ |  | shares |  | fair value
​ | ​ | ​ | ​ | (in years)
Unvested as of December 31, 2020 | ​ | - | ​ | ​ | ​
Granted | ​ | 248,903 | ​ | $ | 2.10
Vested | ​ | - | ​ | ​ | ​
Forfeited | ​ | - | ​ | ​ | ​
Unvested as of September 30, 2021 | ​ | 248,903 | ​ | $ | 2.10
Schedule of stock-based compensation expense was classified in the consolidated statements of operations | Stock-based compensation expense was classified in the condensed consolidated statements of operations as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue | ​ | $ | 106 | ​ | $ | 20 | ​ | $ | 221 | ​ | $ | 62
General and administrative | ​ |  | 345 | ​ |  | 72 | ​ |  | 680 | ​ |  | 223
Sales and marketing | ​ |  | 76 | ​ |  | 11 | ​ |  | 158 | ​ |  | 42
Research and development | ​ |  | 57 | ​ |  | 12 | ​ |  | 106 | ​ |  | 34
Total stock-based compensation expense | ​ | $ | 584 | ​ | $ | 115 | ​ | $ | 1,165 | ​ | $ | 361

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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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