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Stock-based Awards
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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(66,904)2.68  
Forfeited/expired(808,004)8.44  
Outstanding at September 30, 20225,203,272 $9.43 5.5
At September 30, 2022, total remaining stock-based compensation expense for unvested stock option awards was $2.5 million, which is expected to be recognized over a weighted-average period of 2.2 years. For the three months ended September 30, 2022 and 2021, the Company recorded stock-based compensation expense for stock option awards of $0.3 million and $0.5 million, respectively. For the nine months ended September 30, 2022 and 2021, the Company recorded stock-based compensation expense for stock option awards of $1.1 million and $3.1 million, respectively.
Restricted Stock Units
Activity in connection with restricted stock units is as follows for the nine months ended September 30, 2022:
 Number of
Shares		Weighted- Average Grant Date Fair Value
Non-vested — December 31, 20217,536,114 $4.60 
Granted6,657,994 4.03 
Vested(2,305,391)4.64 
Forfeited(1,436,311)4.54 
Non-vested — September 30, 202210,452,406 $4.24 
At September 30, 2022, total remaining stock-based compensation expense for non-vested restricted stock units was $37.5 million, which is expected to be recognized over a weighted-average period of 2.9 years. For the three months ended September 30, 2022 and 2021, the Company recorded $4.8 million and $3.9 million in stock-based compensation expense for restricted stock units, respectively. For the nine months ended September 30, 2022 and 2021, the Company recorded $12.1 million and $12.9 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
September 30,		Nine Months Ended
September 30,
 2022202120222021
Cost of revenue$51 $44 $134 $181 
Sales and marketing1,219 1,271 3,627 5,742 
Technology and development1,126 1,098 3,082 3,445 
General and administrative2,793 2,037 6,331 6,624 
Total stock-based compensation expense5,189 4,450 13,174 15,992 
Amount capitalized to internal software use248 318 784 1,015 
Total stock-based compensation cost$5,437 $4,768 $13,958 $17,007