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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Mar. 21, 2016
Mar. 31, 2016
Nov. 30, 2013
Jan. 01, 2017
Jan. 03, 2016
Dec. 28, 2014
Dec. 09, 2016
Jul. 31, 2013
Class of Warrant or Right [Line Items]                
Shares of common stock authorized to issue (in shares)       100,000,000 100,000,000      
Shares of authorized but unissued undesignated preferred stock (in shares)       10,000,000 10,000,000      
Dollar amount of offerings (up to)             $ 40,000 $ 40,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001 $ 0.001 $ 0.001      
Underwritten public offering price (in dollars per share) $ 1.00 $ 1.00 $ 2.90 $ 1.39        
Proceeds from issuance of common stock $ 8,800 $ 8,800 $ 23,100 $ 11,127 $ 910 $ 6,638    
Underwriter's commission and other offering expenses   $ 1,200 $ 2,200 $ 1,197 $ 0      
Warrants outstanding (in warrants)       2,300,000        
June 2012 Financing                
Class of Warrant or Right [Line Items]                
Warrants outstanding (in warrants)       2,300,000        
Strike price (in dollars per share)       $ 2.98        
Common Stock at Par Value                
Class of Warrant or Right [Line Items]                
Issuance of common stock from exercise of warrants (in shares) 10,000,000.0 10,000,000 8,740,000     36,000