SHARE BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Schedule of restricted stock activity

The following table summarizes the Company’s restricted stock activity during the six months ended June 30, 2016:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value
Outstanding December 31, 2015	429,666		$	20.38
Granted	130,000		16.01
Vested	(77,666	)	16.63
Forfeited/canceled	(34,335	)	12.07
Outstanding June 30, 2016	447,665		$	20.40

Schedule of stock option issuances and balances outstanding

The following table summarizes stock option activity during the six months ended June 30, 2016:

	Shares Underlying Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2015	5,665,584		$	17.05	8.75	$	31,542
Granted	1,381,750		16.09
Exercised	(166,611	)	9.43
Forfeited/canceled	(157,741	)	20.58
Outstanding at June 30, 2016	6,722,982		$	16.96	8.21	$	26,854

Schedule of Share based compensation expenses

The following table sets forth total non-cash stock-based compensation by operating statement classification for the three and six months ended June 30, 2016 and 2015 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Research and development	$	2,641	$	1,749	$	5,127	$	3,968
Selling, general & administrative	4,852		3,245		9,159		6,599
Total	$	7,493	$	4,994	$	14,286	$	10,567