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Stock-based compensation | 6 Months Ended
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Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Stock-based compensation | Stock-based compensation Stock option valuation The Company estimates the fair value of stock options on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model requires estimates of highly subjective assumptions, which affect the fair value of each stock option. ⮚Risk-Free Interest Rate. The Company estimates its risk-free interest rate by using the yield on actively traded non-inflation-indexed U.S. treasury securities with contract maturities equal to the expected term. ⮚Expected Term. The expected term of the Company’s options represents the period that the stock-based awards are expected to be outstanding. The Company has estimated the expected term of its employee awards using the SAB Topic 14 Simplified Method allowed by the FASB and SEC, for calculating expected term as it has limited historical exercise data to provide a reasonable basis upon which to otherwise estimate expected term. Certain of the Company’s options began vesting prior to the grant date, in which case the Company uses the remaining vesting term at the grant date in the expected term calculation. ⮚Expected Volatility. As the Company is privately held and there has been no public market for its common stock to date, the expected volatility is based on the average historical stock price volatility of comparable publicly-traded companies in its industry peer group, financial, and market capitalization data. ⮚Expected Dividend Yield. The Company has not declared or paid dividends to date and does not anticipate declaring dividends. As such, the dividend yield has been estimated to be zero. ⮚Fair Value of Underlying Common Stock. Because the Company’s common stock is not yet publicly traded, the Company must estimate the fair value of common stock. The Board of Directors considers numerous objective and subjective factors to determine the fair value of the Company’s common stock at each meeting in which awards are approved. The factors considered include, but are not limited to: (i) the results of contemporaneous independent third-party valuations of the Company’s common stock; (ii) the prices, rights, preferences, and privileges of the Company’s Convertible Redeemable Preferred Stock relative to those of its common stock; (iii) the lack of marketability of the Company’s common stock; (iv) actual operating and financial results; (v) current business conditions and projections; (vi) the likelihood of achieving a liquidity event, such as an initial public offering or sale of the Company, given prevailing market conditions; and (vii) precedent transactions involving the Company’s shares. There were no options granted during the six months ended June 30, 2022. The assumptions used to estimate the fair value of stock options granted during the six months ended June 30, 2021 are as follows:
| Six months ended June 30,
| 2022 |  | 2021
Expected dividend yield | — |  |  | 0 | %
Expected volatility | — |  |  | 50 | %
Expected term (years) | — |  |  | 6.08
Risk-free interest rate | — |  |  | 0.83 | %
Common stock option activity The following table summarizes the Company’s stock option activity during the periods presented (in thousands except share and per share data):
| Number of options outstanding | Weighted average exercise price ($) | Weighted average remaining contractual term (years) | Aggregate intrinsic value ($)
Balance as of December 31, 2021 | 16,336,134 | 0.81 |  | 8.55 | 80,179 |
Granted | — | — |  |  |
Exercised | (174,378) | 0.81 |  |  |
Forfeited | (840,002) | 0.81 |  |  |
Expired | (11,077) | 0.81 |  |  |
Balance as of June 30, 2022 | 15,310,677 | 0.81 |  | 7.96 | 75,144 |
Unvested as of June 30, 2022 | 4,698,271 | 0.81 |  | 7.77 | 73,479 |
Exercisable as of June 30, 2022 | 10,612,406 | 0.81 |  | 7.43 | 52,098 |
The aggregate intrinsic value of stock options was calculated as the difference between the exercise price of the stock options and the estimated fair value of the Company’s common stock for those stock options that had exercise prices lower than the fair value of the Company’s common stock. The weighted average grant date fair values per share of stock options granted during the six months ended June 30, 2022 was nil as no stock options were granted. The weighted average grant date fair values per share of stock options granted during the six months ended June 30, 2021 was 0.62. The total fair values of the stock options vested during the six months ended June 30, 2022 and 2021 was $1,703,000 and $535,000 respectively. Common stock warrants On April 14, 2022, 617,972 common stock warrants with an exercise price of $1.75 expired. As of June 30, 2022 there are no common stock warrants outstanding. Preferred stock warrants The Company did not record any movements during the six months ended June 30, 2022. As of June 30, 2022, the following United States dollar preferred stock warrants were outstanding and exercisable:
| Number of warrants outstanding | Weighted average exercise price ($) | Expiry Date | Number exercisable
| 3,247,637 | $ | 1.92 |  | 29-Nov-26 | 1,299,055
Total, June 30, 2022 | 3,247,637 | $ | 1.92 |  |  | 1,299,055
Stock-based compensation The following table summarizes the stock-based compensation expense classified in the consolidated statements of operations and comprehensive loss as follows (in thousands):
| Three months ended June 30,
| 2022 |  | 2021
Research and development | $ | 117 |  |  | $ | 58 |
General and administrative | 641 |  |  | 74 |
Sales and marketing | 58 |  |  | 37 |
Total stock-based compensation | $ | 816 |  |  | $ | 169 |
| Six months ended June 30,
| 2022 |  | 2021
Research and development | $ | 210 |  |  | $ | 88 |
General and administrative | 1,270 |  |  | 173 |
Sales and marketing | 120 |  |  | 69 |
Total stock-based compensation | $ | 1,600 |  |  | $ | 330 |

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