FAIR VALUE MEASUREMENT - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 27, 2016	Dec. 31, 2015
Assets measured at fair value:
Restricted cash	$ 1,811	$ 1,811
Fair Value, Measurements, Recurring | Fair Value Disclosure, Total
Assets measured at fair value:
Total assets measured at fair value	11,827	16,819
Fair Value, Measurements, Recurring | Money Market Funds | Fair Value Disclosure, Total
Assets measured at fair value:
Money market funds	10,019	15,011
Restricted cash	1,808	1,808
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets measured at fair value:
Total assets measured at fair value	11,827	16,819
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Money Market Funds
Assets measured at fair value:
Money market funds	10,019	15,011
Restricted cash	$ 1,808	$ 1,808