FAIR VALUE MEASUREMENTS AND DERIVATIVE INSTRUMENTS (Liabilities Measured at Fair Value Using Level 3 Significant Unobservable Inputs) (Details) - USD ($)	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2014
Warrant Liabilities
Reconciliation of all liabilities
Increase to Additional paid-in capital	$ 0	$ 3,700,000
Warrant Liabilities | Other income
Reconciliation of all liabilities
Change in fair value		252,000	$ (382,000)
Significant Unobservable Inputs (Level 3) | Warrant Liabilities
Reconciliation of all liabilities
Balance at beginning of the period		0	3,276,000	$ 3,276,000
Change in fair value			382,000
Write-off due to conversion and IPO			(3,658,000)
Significant Unobservable Inputs (Level 3) | Senior Convertible Note Derivative Liability
Reconciliation of all liabilities
Balance at beginning of the period		0	5,057,000	5,057,000
Change in fair value			1,633,000
Write-off due to conversion and IPO			(6,690,000)
Significant Unobservable Inputs (Level 3) | Senior Convertible Note Derivative Liability | Other income
Reconciliation of all liabilities
Change in fair value				1,200,000
Write-off due to conversion and IPO		$ 0	$ 1,600,000
Balance at end of the period	$ 0
Increase to Additional paid-in capital				$ 5,500,000