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Inventory (Tables)
 9 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventory at December 31, 2017 and March 31, 2017 consisted of the following (in thousands):
 
December 31,
2017
 
March 31,
2017
Raw materials
$
5,544

 
$
4,263

Work-in-process
1,626

 
426

Finished goods
7,931

 
8,016

Deferred program costs
2,028

 
4,757

Net inventory
$
17,129

 
$
17,462