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Stock-based Awards
 6 Months Ended
Jun. 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 six months ended June 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(591,738)7.32  
Outstanding at June 30, 20225,419,538 $9.53 5.5
At June 30, 2022, total remaining stock-based compensation expense for unvested stock option awards was $2.9 million, which is expected to be recognized over a weighted-average period of 2.4 years. For the three months ended June 30, 2022 and 2021, the Company recorded stock-based compensation expense for stock option awards of $0.4 million and $1.0 million, respectively. For the six months ended June 30, 2022 and 2021, the Company recorded stock-based compensation expense for stock option awards of $0.8 million and $2.6 million, respectively.
Restricted Stock Units
Activity in connection with restricted stock units is as follows for the six months ended June 30, 2022:
 Number of
Shares		Weighted- Average Grant Date Fair Value
Non-vested — December 31, 20217,536,114 $4.60 
Granted6,514,994 4.06 
Vested(1,626,096)4.72 
Forfeited(1,003,114)4.75 
Non-vested — June 30, 202211,421,898 $4.26 
At June 30, 2022, total remaining stock-based compensation expense for non-vested restricted stock units was $43.9 million, which is expected to be recognized over a weighted-average period of 3.0 years. For the three months ended June 30, 2022 and 2021, the Company recorded $4.1 million and $4.2 million in stock-based compensation expense for restricted stock units, respectively. For the six months ended June 30, 2022 and 2021, the Company recorded $7.2 million and $8.9 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
June 30,		Six Months Ended
June 30,
 2022202120222021
Cost of revenue$46 $66 $83 $137 
Sales and marketing1,233 1,512 2,408 4,471 
Technology and development1,056 1,159 1,956 2,347 
General and administrative2,152 2,420 3,538 4,587 
Total stock-based compensation expense4,487 5,157 7,985 11,542 
Amount capitalized to internal software use290 350 536 697 
Total stock-based compensation cost$4,777 $5,507 $8,521 $12,239