STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2019

STOCK BASED COMPENSATION

Schedule of stock-based compensation expense

Stock-based compensation expense is included in the consolidated statements of operations as follows:

	Year Ended December 31,
(In thousands)	2019		2018		2017
Research and development	$	—	$	—	$	697
General and administrative		2,056		3,233		9,136
Total stock-based compensation expense	$	2,056	$	3,233	$	9,833

Schedule of stock-based compensation expense included in the consolidated statements of operations by award type

Stock-based compensation expense included in the consolidated statements of operations by award type is as follows:

	Year Ended December 31,
(In thousands)	2019		2018		2017
Stock options	$	—	$	305	$	593
RSUs		1,431		1,650		2,282
RSAs		615		1,920		4,497
Performance-based RSAs		—		—		242
Market-based RSUs (PSUs)		—		(224)		291
Market-based RSAs (PSAs)		—		(464)		1,855
ESPP		10		46		73
Total stock-based compensation expense	$	2,056	$	3,233	$	9,833

Schedule of unrecognized stock-based compensation cost

As of December 31, 2019, the unrecognized stock-based compensation cost and the estimated weighted-average amortization period were as follows:

	Unrecognized		Weighted-Average
	Compensation		Amortization
(In thousands)	Cost		Period (Years)
RSUs	$	376	0.3
RSAs		942	2.5
Total unrecognized compensation cost	$	1,318

Summary of equity award activity under the 2012 plan and prior plans

The following table summarizes equity award activity under the 2012 Plan and prior plans and related information:

		Weighted-
		Average			Weighted-			Weighted-
		Exercise			Average			Average
	Number of	Price of		Number of	Fair Value		Number of	Fair Value
	outstanding	Outstanding		outstanding	per Share		outstanding	per Share
(In thousands, except per share data)	options	Options		RSUs and PSUs	at Grant		RSAs and PSAs	at Grant
Balance as of December 31, 2018	1,237	$	24.00	105	$	15.54	77	$	15.37
Granted	—		—	81		13.72	53		15.08
Exercised	(45)		12.27	—		—	—		—
Released RSUs/RSAs	—		—	(92)		15.55	(52)		16.43
Forfeited	(105)		27.14	—		—	—		—
Balance as of December 31, 2019	1,087		24.18	94		13.94	78		14.46