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STOCK-BASED COMPENSATION - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - USD ($)
3 Months Ended 12 Months Ended
Jan. 01, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for issuance under share-based compensation plan       800,000
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Increase to shares of common stock reserved for issuance 230,681 2,000,000    
Shares reserved for issuance under share-based compensation plan     1,804,669  
Offering period, term     2 years  
Percent of fair market value of common stock the price at which common stock is purchased     85.00%  
Maximum amount any participant may purchase per calendar year     $ 25,000  
Maximum number of shares to be purchased per employee in any six-month period     5,000  
Weighted average purchase price (in dollars per share)     $ 4.24  
Number of shares issued under ESPP     1,226,012 0
ESPP | First day of fiscal years 2016 and 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum annual increase of common stock reserved for issuance under share-based compensation plan     1,000,000  
Maximum annual increase of common stock reserved for issuance under share-based compensation plan, as a percent of total shares outstanding     2.00%  
ESPP | First day of fiscal years 2018 through 2023        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum annual increase of common stock reserved for issuance under share-based compensation plan     1,000,000  
Maximum annual increase of common stock reserved for issuance under share-based compensation plan, as a percent of total shares outstanding     1.00%