DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Impact of the adoption of ASU 2017-11 on equity (in thousands):

	Common stock		Additional paid in capital		Accumulated other comprehensive loss			Accumulated deficit			Total stockholders' equity (deficit)
Balance–December 31, 2017	$	4	$	471,800	$	(1,015	)	$	(177,655	)	$	293,134
Balance-March 31, 2018 before effect of ASU 17-11	4		481,323		(1,529		)	(196,033		)	283,765
Effect of ASU 17-11	—		5,394					10,316			15,710
Balance–March 31, 2018	$	4	$	486,717	$	(1,529	)	$	(185,717	)	$	299,475

Schedule of assumptions for valuation of warrants

The Company calculated the fair value of the warrants using the Black-Scholes Model as of December 31, 2017, using the following assumptions:

	December 31, 2017
Fair value of common stock	$	21.07
Remaining life of the warrants (in years)	0.1 - 2.0 years
Risk-free interest rate*	1.39 - 1.89%
Expected volatility**	33 - 43%
Dividend yield	—		%

*The risk-free interest rate is based on the U.S. Treasury security rates for the remaining term of the warrants at the measurement date.

**Expected volatility is based on an analysis of the Company’s historical volatility.