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Inventory
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventory Inventory
A summary of inventory as of December 31, 2019 and 2018 is as follows:
 
December 31,
 
2019
 
2018
Homes for sale
$
36,982

 
$
12,649

Homes not available for sale
3,163

 
2,328

Homes under improvement
34,445

 
7,717

Inventory
$
74,590

 
$
22,694



Inventory costs include direct home acquisition costs and any capitalized improvements, net of lower of cost or net realizable value write-downs applied on a specific home basis. As of December 31, 2019 and December 31, 2018, lower of cost or net realizable value write-downs were $143 and $190, respectively.

The following is the inventory activity for the year ended December 31, 2019:
Inventory as of December 31, 2018
$
22,694

Purchases and capitalized improvements to inventory
274,758

Relief of inventory to cost of revenue
(222,909
)
Lower of cost or net realizable value write-downs, net
47

Inventory as of December 31, 2019
$
74,590