STOCKHOLDERS' EQUITY - Common Stock and Preferred Stock (Details) - $ / shares	Dec. 31, 2015	Dec. 31, 2014	Apr. 02, 2014
Equity [Abstract]
Common stock, shares authorized	500,000,000	500,000,000	500,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Preferred stock, shares authorized	25,000,000	25,000,000	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, shares issued	49,017,293	46,028,908
Common stock, shares outstanding	49,017,293	46,028,908
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0