Annual report pursuant to Section 13 and 15(d)

Changes in Inventory Reserves (Detail)

v3.3.1.900
Changes in Inventory Reserves (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]      
Inventory reserve at January 1, $ 1,669 $ 1,708 $ 1,669
Additions 1,087 179 1,644
Write offs (810) (218) (1,605)
Inventory reserve at December 31, $ 1,946 $ 1,669 $ 1,708