SHARE-BASED COMPENSATION - Summary of Warrant Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 01, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number of warrants, exercisable		123,984
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward]
Exercisable warrants, weighted average exercise price (in dollars per share)		$ 11.51
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward]
Options converted	51,550
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	14,980
Shares issued in period	7,222
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number of warrants, outstanding, beginning balance (in shares)	123,984
Number of warrants, outstanding, ending balance (in shares)	109,004	123,984
Number of warrants, exercisable	109,004
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Exercise Price [Roll Forward]
Outstanding warrants, weighted average exercise price, beginning balance (in dollars per share)	$ 11.51
Outstanding warrants, weighted average exercise price, ending balance (in dollars per share)	11.57	$ 11.51
Exercisable warrants, weighted average exercise price (in dollars per share)	$ 11.57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Warrants outstanding, weighted average remaining contractual life	1 year 8 months 27 days	2 years 2 months 9 days
Exercisable warrants, weighted average remaining contractual life	1 year 8 months 27 days	2 years 2 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward]
Outstanding warrants, intrinsic value, beginning balance	$ 577
Outstanding warrants, intrinsic value, ending balance	1,274	$ 577
Exercisable warrants, intrinsic price	$ 1,274	$ 577
Options converted	14,980
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised, Weighted Average Exercise Price	$ 11.13
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period	27,681
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Intrinsic Value [Roll Forward]
Options converted	52,550