NOTE PAYABLE (Details) (USD $)	3 Months Ended		1 Months Ended		6 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jul. 31, 2014	Dec. 31, 2012	Jun. 30, 2014	May 21, 2013	Dec. 31, 2014
Debt Instrument [Line Items]
Interest Expense	$ 4,498,000	$ 2,979,000
Maturity Date	Aug. 01, 2019
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	9,000,000
2016	12,000,000
2017	12,000,000
2018	12,000,000
2019	12,000,000
2020 and thereafter	3,000,000
Total	60,000,000
Loan Agreement with HC Royalty [Member]
Debt Instrument [Line Items]
Total amount of loan	50,000,000		10,000,000
Number of tranches in loan	2
Amount of loan per tranche	25,000,000
Annual fixed interest rate (in hundredths)			8.00%
Original interest rate (in hundredths)			10.75%
Revised annual interest rate (in hundredths)			8.00%
Amount of first net revenues for calendar year			50,000,000
Excess revenue (in hundredths)			2.00%
Interest Expense	3,000,000	2,800,000
First payment amount			3,000,000
Maturity Date			Jun. 30, 2015
Total payment required to terminate loan obligation immediately			120,000,000
Long-term Debt, Fiscal Year Maturity [Abstract]
Unamortized debt issuance costs	2,100,000						2,300,000
Amortization expense	200,000	100,000
Loan Agreement with HC Royalty [Member] | First Tranche [Member]
Debt Instrument [Line Items]
Draw down on loan				23,400,000
Royalty rate of first threshold of PROCYSBI and future approved product net revenues for calendar year (in hundredths)					6.25%
Amount of first threshold of PROCYSBI and future approved product net revenues for calendar year					25,000,000
Royalty rate of amount between first and second threshold of PROCYSBI and future approved product net revenues for calendar year (in hundredths)					3.00%
Amount of second threshold of PROCYSBI and future approved product net revenues for calendar year					50,000,000
Royalty rate for amount in excess of second threshold of PROCYSBI and future approved product net revenues for calendar year (in hundredths)					1.00%
Loan Agreement with HC Royalty [Member] | Second Tranche [Member]
Debt Instrument [Line Items]
Draw down on loan						23,700,000
Royalty rate of first threshold of PROCYSBI and future approved product net revenues for calendar year (in hundredths)					6.00%
Amount of first threshold of PROCYSBI and future approved product net revenues for calendar year					25,000,000
Royalty rate of amount between first and second threshold of PROCYSBI and future approved product net revenues for calendar year (in hundredths)					3.00%
Amount of second threshold of PROCYSBI and future approved product net revenues for calendar year					$ 50,000,000
Royalty rate for amount in excess of second threshold of PROCYSBI and future approved product net revenues for calendar year (in hundredths)					1.00%