Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Narrative)

v3.7.0.1
Stockholders' Equity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 01, 2017
Apr. 01, 2017
Feb. 07, 2017
Mar. 31, 2017
Mar. 31, 2016
Warrant exercise price       $ 8.28  
Proceeds from issuance of shares       $ 10,654
Stock option exercises       18,773  
Subsequent Event [Member]          
Number of shares issued   51,943      
Cashless Warrants [Member] | Subsequent Event [Member]          
Number of shares issued 56,136        
Stock Purchase Agreement [Member] | Johnson Controls [Member]          
Number of shares issued     939,005    
Share price (in dollars per share)     $ 11.33    
Proceeds from issuance of shares     $ 10,600