SHARE BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of service based restricted stock activity

The following table summarizes the Company’s service based restricted stock unit activity during the nine months ended September 30, 2020:

	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested December 31, 2019	763,728	$	19.64
Granted	661,688
Vested	(185,202)
Forfeited/canceled	(79,491)
Unvested September 30, 2020	1,160,723	$	17.19

Schedule of performance based restricted stock activity

The following table summarizes the Company’s performance based restricted stock unit activity during the nine months ended September 30, 2020:

	Number of Restricted Stock Units	Weighted Average Grant Date Fair Value
Unvested December 31, 2019	233,500	$	20.90
Granted	150,000
Vested	(73,250)
Forfeited/canceled	(110,250)
Unvested September 30, 2020	200,000	$	16.67

Schedule of stock option issuances and balances outstanding

The following table summarizes stock option activity during the nine months ended September 30, 2020:

	Shares Underlying Options	Weighted Average Exercise Price	Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2019	7,371,733	$19.52	6.63	$	4,906
Granted	1,497,375
Exercised	(103,270)
Forfeited/canceled	(394,340)
Outstanding at September 30, 2020	8,371,498	$18.95	6.58	$	17,968

Schedule of share based compensation expenses

The following table sets forth total share-based compensation for the three and nine months ended September 30, 2020 and 2019 (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Research and development	$	2,510	$	1,735	$	6,968	$	5,301
Selling, general & administrative	2,888		2,605		10,294		11,307
Total	$	5,398	$	4,340	$	17,262	$	16,608