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Inventory
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Inventory
The following is a summary of inventory as of the dates presented:
June 30, 2020December 31, 2019
Homes for sale$4,383  $36,982  
Homes not available for sale426  3,163  
Homes under improvement4,628  34,445  
Inventory$9,437  $74,590  

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 June 30, 2020 and December 31, 2019, lower of cost or net realizable value write-downs were $151 and $143, respectively.

The following is the inventory activity for the six months ended June 30, 2020:
Inventory as of January 1, 2020
$74,590  
Purchases and capitalized improvements to inventory
74,757  
Relief of inventory to cost of revenue
(139,902) 
Lower of cost or net realizable value write-downs, net
(8) 
Inventory as of June 30, 2020
$9,437