ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other long-term liabilities	$ 1,465	$ 1,994
Uncertain income tax positions recorded in noncurrent liabilities	200	700
Accrued lease restoration costs	600	400
Accrued benefit liability	$ 451	$ 479