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Inventory
 6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventory Inventory
Since we acquired the remaining 51% interest in Hi-Power on April 9, 2021, our inventory balances as of June 30, 2021 include all inventories held at our manufacturing facility, Hi-Power. The following table provides information about inventory balances:
 June 30, 2021December 31, 2020
Finished goods$1,387 $214 
Work-in-process52 — 
Raw materials2,994 — 
     Total Inventory, net$4,434 $214