STOCKHOLDERS' EQUITY - Warrant (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 19, 2017	Jun. 30, 2017	Dec. 31, 2016
Class of Warrant or Right [Line Items]
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Warrant liability	$ 3,300	$ 3,313	$ 0
Common Stock Warrant
Class of Warrant or Right [Line Items]
Common stock, par value (in dollars per share)		$ 0.0001
Right to acquire variable amount of common stock, term	15 months
Common Stock Warrant | Soryn HLDR
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)	$ 3.18
Term of warrant	3 years
Common stock | Common Stock Warrant | Soryn HLDR
Class of Warrant or Right [Line Items]
Number of shares called by warrant	2,000,000	2,300,000
Aggregate intrinsic value of shares called by warrant		$ 200