FAIR VALUE - Recurring (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Cash and cash equivalents	$ 55,776	$ 64,943
Liabilities:
Contingent consideration	74,966	71,115
Warrant liability		24
Quoted prices in active markets for identical items (Level 1)
Assets:
Cash and cash equivalents	55,776	64,943
Significant unobservable inputs (Level 3)
Liabilities:
Contingent consideration	$ 74,966	71,115
Warrant liability		$ 24