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Stock-based compensation (Tables)
6 Months Ended
Jun. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Assumptions used to estimate fair value of stock options granted
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,
20222021
Expected dividend yield— %
Expected volatility— 50 %
Expected term (years)— 6.08
Risk-free interest rate— 0.83 %
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 outstandingWeighted  average  exercise  price  ($)Weighted average remaining contractual term (years)Aggregate intrinsic value ($)
Balance as of December 31, 202116,336,1340.81 8.5580,179 
Granted— 
Exercised(174,378)0.81 
Forfeited(840,002)0.81 
Expired(11,077)0.81 
Balance as of June 30, 202215,310,6770.81 7.9675,144 
Unvested as of June 30, 20224,698,2710.81 7.7773,479 
Exercisable as of June 30, 202210,612,4060.81 7.4352,098 
Preferred stock warrants outstanding and exercisable
As of June 30, 2022, the following United States dollar preferred stock warrants were outstanding and exercisable:
Number of warrants outstandingWeighted average exercise price ($)Expiry DateNumber exercisable
3,247,637$1.92 29-Nov-261,299,055
Total, June 30, 20223,247,637$1.92  1,299,055
Stock-based compensation expense
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,
20222021
Research and development$117 $58 
General and administrative641 74 
Sales and marketing58 37 
Total stock-based compensation$816 $169 
Six months ended June 30,
20222021
Research and development$210 $88 
General and administrative1,270 173 
Sales and marketing120 69 
Total stock-based compensation$1,600 $330