Quarterly report pursuant to Section 13 or 15(d)

Product Warranties (Details Textual)

v3.7.0.1
Product Warranties (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Product Warranties (Textual) [Abstract]    
Current portions of warranty reserve $ 158 $ 163
Non-current portions of the warranty reserve $ 227 $ 232
IBW [Member] | Minimum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P1Y  
IBW [Member] | Maximum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P5Y  
ISMS [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P1Y  
CNS [Member] | Minimum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P1Y  
CNS [Member] | Maximum [Member]    
Product Warranties (Textual) [Abstract]    
Standard Product Warranty Description P7Y