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STOCK AWARD PLAN AND STOCK-BASED COMPENSATION - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 02, 2018
Dec. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jan. 01, 2018
Stock Award Plan and Stock-Based Compensation            
Fair value of common stock on grant date (in dollars per share)     $ 4.95      
Total intrinsic value of the stock options exercised       $ 0.2    
Dividend yield (as a percent)     0.00%      
Stock-based compensation expense     $ 2.1 $ 1.3    
Employee Stock Option            
Stock Award Plan and Stock-Based Compensation            
Shares issued       0    
Fair value of common stock on grant date (in dollars per share)     $ 4.47      
Total unrecognized compensation costs     $ 16.9      
Weighted-average period over which unrecognized compensation costs is expected to be recognized     3 years 2 months 12 days      
Dividend yield (as a percent)     0.00%      
Non-Employees Stock Options            
Stock Award Plan and Stock-Based Compensation            
Shares issued     40,000      
Dividend yield (as a percent)     0.00% 0.00%    
Stock-based compensation expense     $ 0.2 $ 0.1    
RSUs            
Stock Award Plan and Stock-Based Compensation            
Total unrecognized compensation costs     $ 2.0      
Weighted-average period over which unrecognized compensation costs is expected to be recognized     2 years 10 months 24 days      
Vesting rights percentage     25.00%      
Vesting period     4 years      
Description of vesting rights     RSUs awarded to employees generally vest one-fourth per year over four years from the anniversary of the date of grant      
2013 Equity Incentive Plan            
Stock Award Plan and Stock-Based Compensation            
Increase in number of shares authorized for issuance         750,000  
Shares authorized for issuance under the plan           6,531,333
Additional shares authorized for issuance under the plan as percentage of total shares outstanding     4.00%      
2013 Equity Incentive Plan | Employee Stock Option | Common Stock            
Stock Award Plan and Stock-Based Compensation            
Shares issued   775,000        
2013 Equity Incentive Plan | RSUs | Common Stock            
Stock Award Plan and Stock-Based Compensation            
Shares issued   40,000        
Maximum | 2013 Equity Incentive Plan | Employee Stock Option            
Stock Award Plan and Stock-Based Compensation            
Term of share-based award 10 years