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Stock-based Awards
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Stock-based Awards Stock-based Awards
Stock Options
A summary of the Company’s stock option activity for the three months ended March 31, 2022 is as follows:
 Number of
Options		Weighted-Average Exercise PriceWeighted-Average
Remaining
Contractual Life
   (in years)
Outstanding at December 31, 20216,078,180 $9.24 6.2
Granted— —  
Exercised(60,985)2.68  
Forfeited/expired(297,208)7.30  
Outstanding at March 31, 20225,719,987 $9.41 5.6
At March 31, 2022, total remaining stock-based compensation expense for unvested stock option awards was $3.3 million, which is expected to be recognized over a weighted-average period of 2.6 years. For the three months ended March 31, 2022 and 2021, the Company recorded stock-based compensation expense for stock option awards of $0.4 million and $1.6 million, respectively.
Restricted Stock Units
Activity in connection with restricted stock units is as follows for the three months ended March 31, 2022:
 Number of
Shares		Weighted- Average Grant Date Fair Value
Non-vested — December 31, 20217,536,114 $4.60 
Granted5,286,739 4.24 
Vested(704,409)4.66 
Forfeited(628,698)4.91 
Non-vested — March 31, 202211,489,746 $4.41 
At March 31, 2022, total remaining stock-based compensation expense for non-vested restricted stock units was $45.9 million, which is expected to be recognized over a weighted-average period of 3.1 years. For the three months ended March 31, 2022 and 2021, the Company recorded $3.1 million and $4.8 million in stock-based compensation expense for restricted stock units, respectively.
Stock-based Compensation Cost
The Company recorded stock-based compensation cost relating to stock options and restricted stock units in the following categories on the accompanying condensed consolidated statements of comprehensive loss (in thousands):
 Three Months Ended
March 31,
 20222021
Cost of revenue$37 $71 
Sales and marketing1,175 2,959 
Technology and development900 1,188 
General and administrative1,386 2,167 
Total stock-based compensation expense3,498 6,385 
Amount capitalized to internal software use246 347 
Total stock-based compensation cost$3,744 $6,732