FAIR VALUE MEASUREMENT - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 31, 2013
Assets measured at fair value:
Restricted cash	$ 2,093	$ 2,087
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Assets measured at fair value:
Total assets measured at fair value	11,890	1,880
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Money Market Funds
Assets measured at fair value:
Cash and cash equivalents	10,006	5
Restricted cash	1,884	1,875
Fair Value, Measurements, Recurring | Fair Value Disclosure, Total
Assets measured at fair value:
Total assets measured at fair value	11,890	1,880
Fair Value, Measurements, Recurring | Fair Value Disclosure, Total | Money Market Funds
Assets measured at fair value:
Cash and cash equivalents	10,006	5
Restricted cash	$ 1,884	$ 1,875