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Description of Business (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 23, 2016
USD ($)
$ / shares
shares
Nov. 12, 2015
USD ($)
Apr. 01, 2017
USD ($)
patent
Apr. 02, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
Description of Business            
Number of issued and pending U.S. and foreign patents | patent     100      
Net loss     $ (3,342) $ (1,413) $ 11,200 $ 20,500
NRE fee received from Samsung   $ 8,000        
Proceeds from issuance of SVIC Note and SVIC Warrant   $ 15,000        
Common stock shares issued | shares 9,200,000          
Shares Issued, Price Per Share | $ / shares $ 1.25          
Proceeds from issuance of common stock $ 10,300