Inventories

12 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

5. Inventories

Inventories, net of allowances, by major categories are summarized as follows:

	March 31,
	2016		2017
Raw materials	$	4,038	$	5,740
Work-in-progress		2,372		3,404
Finished goods		1,704		1,544
	$	8,114	$	10,688

Obsolescence allowance for inventory is as follows:

	Year ended March 31
	2015			2016			2017
Balance at beginning of the year	$	3,554		$	3,887		$	3,635
Additional charges/(usage), net		341			(252	)		(65	)
Written off		(8	)		—			—
Balance at the end of the year	$	3,887		$	3,635		$	3,570