BUSINESS COMBINATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 01, 2015	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Common stock, par value per share (in usd per share)		$ 0.001	$ 0.001
Beijing E-Town Dragon Semiconductor Industry Investment Center
Business Acquisition [Line Items]
Common stock, par value per share (in usd per share)	$ 0.001
Conversion of stock outstanding (in usd per share)	$ 3.80
Termination fee	$ 8.6
Beijing E-Town Dragon Semiconductor Industry Investment Center | Parent
Business Acquisition [Line Items]
Termination fee	$ 17.2