Annual report pursuant to Section 13 and 15(d)

Segment Information - Additional Information (Detail)

v3.6.0.2
Segment Information - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2016
USD ($)
Segment
Mar. 31, 2015
USD ($)
Mar. 31, 2014
USD ($)
Segment Reporting Information [Line Items]                      
Number of reportable operating segments | Segment                 1    
Net sales $ 22,301 $ 17,323 $ 22,798 $ 27,617 $ 37,455 $ 33,646 $ 35,566 $ 28,502 $ 90,039 $ 135,169 $ 102,218
SUDAN [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 0 0 0
IRAN [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 0 0 0
SYRIA [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 $ 0 $ 0 $ 0