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Organization and Summary of Significant Accounting Policies - Inventory and Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventories    
Serialized parts $ 16,270 $ 16,413
Non-serialized parts 18,130 17,181
Total Inventory, gross 34,400 33,594
Less: obsolete and slow moving reserve (150) (150)
Total Inventory, net $ 34,250 $ 33,444