Inventories (Tables)

12 Months Ended

Dec. 31, 2016

Inventory Disclosure [Abstract]

Components of inventory

Inventories are as follows (in thousands):

	December 31,
	2016		2015
Raw materials	$	28,626	$	30,127
Work-in-process	2,918		3,044
Finished goods	26,739		17,699
Inventories	$	58,283	$	50,870

Schedule of changes in the reserve for excess and obsolete inventory

Changes in the reserve for excess and obsolete inventory are as follows (in thousands):

	Year ended December 31,
	2016		2015		2014
Balance, beginning of year	$	—	$	—	$	98
Charged to costs and expenses	—		—		10
Deductions	—		—		(108		)
Balance, end of the year	$	—	$	—	$	—