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Stock-based Compensation (Notes)
 9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation
Stock-based compensation expense includes stock options and restricted stock units granted to employees and other service providers and has been reported in the Company’s consolidated statements of operations depending on the function performed by the employee or other service provider. Stock-based compensation expense recognized in each category of the consolidated statements of operations was as follows (in thousands):
 Three Months Ended September 30,Nine Months Ended September 30,
 2022202120222021
Veterinary invoice expense$998 $769 $3,232 $3,740 
Other cost of revenue474 542 1,906 2,029 
Technology and development1,184 749 3,193 2,213 
General and administrative3,792 2,271 9,281 6,412 
New pet acquisition expense2,195 2,112 7,214 7,024 
Total expensed stock-based compensation8,643 6,443 24,826 21,418 
Capitalized stock-based compensation542 170 1,144 463 
Total stock-based compensation$9,185 $6,613 $25,970 $21,881 

As of September 30, 2022, the Company had 1,167,569 unvested restricted stock units. Stock-based compensation expenses of $89.1 million related to unvested restricted stock units are expected to be recognized over a weighted average period of approximately 2.7 years.
Stock Options
A summary of the Company's stock option activity is as follows:
Number of OptionsWeighted Average Exercise Price per ShareAggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021807,205 $13.39 $95,765 
Granted— — — 
Exercised(124,752)12.73 8,933 
Forfeited(2,564)19.28 — 
Outstanding as of September 30, 2022679,889 13.49 31,233 
Exercisable as of September 30, 2022679,889 $13.49 $31,233 
As of September 30, 2022, stock options outstanding and stock options exercisable had a weighted average remaining contractual life of 3.6 years.
Restricted Stock Units
A summary of the Company’s restricted stock unit activity is as follows:
Number of 
Shares		Weighted Average
Grant Date Fair Value per Share
Unvested shares as of December 31, 20211,087,627 $78.94 
Granted563,527 87.05 
Vested(415,502)73.54 
Forfeited(68,083)81.72 
Unvested shares as of September 30, 20221,167,569 $84.61