Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Summary of Inventories    
Raw materials and subassemblies $ 30,512 $ 44,699
Work in process 3,521 3,788
Finished goods 61,839 43,488
Total inventories 95,872 91,975
Less: Non-current inventories (15,286) (20,446)
Inventories, current $ 80,586 $ 71,529