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Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
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 March 31,
 20222021
Veterinary invoice expense$1,187 $2,299 
Other cost of revenue649 935 
Technology and development908 664 
General and administrative2,423 1,819 
New pet acquisition expense2,382 2,731 
Total expensed stock-based compensation7,549 8,448 
Capitalized stock-based compensation236 162 
Total stock-based compensation$7,785 $8,610 
Share-based Compensation, Stock Options, Activity [Table Text Block]
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(47,204)12.51 4,555 
Forfeited(282)10.23 — 
Outstanding as of March 31, 2022759,719 13.45 57,490 
Exercisable as of March 31, 2022759,719 $13.45 $57,490 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
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 
Granted512,284 89.42 
Vested(214,922)81.97 
Forfeited(18,482)82.70 
Unvested shares as of March 31, 20221,366,507 $82.34