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Inventory
9 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventory
Inventory
Inventory, net of reserves, at December 31, 2018 and March 31, 2018 consisted of the following (in thousands):
 
December 31,
2018
 
March 31,
2018
Raw materials
$
5,777

 
$
7,526

Work-in-process
3,296

 
920

Finished goods
3,637

 
8,767

Deferred program costs
1,296

 
2,567

Net inventory
$
14,006

 
$
19,780


The Company recorded inventory write-downs of $0.2 million and $0.1 million for the three months ended December 31, 2018 and 2017, respectively. The Company recorded inventory write-downs of $0.7 million and $0.4 million for the nine months ended December 31, 2018 and 2017, respectively.  These write-downs were based on the Company's evaluation of its inventory on hand for excess quantities and obsolescence.
Deferred program costs as of December 31, 2018 and March 31, 2018 primarily represent costs incurred on programs where the Company needs to complete performance obligations before the related revenue and costs will be recognized.