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Commitment and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Purchase Commitments for Content Related to Mobile Applications and Websites The amounts due for non-cancelable purchase commitments, excluding homes under contract, as of September 30, 2020, are as follows (in thousands, unaudited):
Purchase Obligations
2020$5,646 
202119,895 
20224,812 
20231,004 
2024394 
202560 
Total future purchase commitments$31,811