FAIR VALUE MEASUREMENTS - Assets and Liabilities Recorded at Fair Value on Recurring Basis on Condensed Balance Sheet (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Total Carrying Value on the Balance Sheet
Assets:
Total assets at fair value	$ 8,676	$ 14,692
Total Carrying Value on the Balance Sheet | Cash and cash equivalents
Assets:
Total assets at fair value	7,015	7,968
Total Carrying Value on the Balance Sheet | Corporate notes and bonds
Assets:
Total assets at fair value	1,593	6,475
Total Carrying Value on the Balance Sheet | U.S. Government and agency securities
Assets:
Total assets at fair value		200
Total Carrying Value on the Balance Sheet | Equity Security
Assets:
Total assets at fair value	68	49
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1)
Assets:
Total assets at fair value	7,083	8,017
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Cash and cash equivalents
Assets:
Total assets at fair value	$ 7,015	$ 7,968
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Corporate notes and bonds
Assets:
Total assets at fair value
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | U.S. Government and agency securities
Assets:
Total assets at fair value
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) | Equity Security
Assets:
Total assets at fair value	$ 68	$ 49
Significant Other Observable Inputs (Level 2)
Assets:
Total assets at fair value	$ 1,593	$ 6,675
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents
Assets:
Total assets at fair value
Significant Other Observable Inputs (Level 2) | Corporate notes and bonds
Assets:
Total assets at fair value	$ 1,593	$ 6,475
Significant Other Observable Inputs (Level 2) | U.S. Government and agency securities
Assets:
Total assets at fair value		$ 200
Significant Other Observable Inputs (Level 2) | Equity Security
Assets:
Total assets at fair value