Quarterly report pursuant to Section 13 or 15(d)

4. Inventories, net (Tables)

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4. Inventories, net (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories, net
    September 30,
2019
    December 31, 
2018
 
Parts   $ 42,896     $ 44,974  
Finished goods     108,348       78,314  
Total     151,244       123,288  
Less inventories reserve     (68,566 )     (53,501 )
Inventories, net   $ 82,678     $ 69,787