Share-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Non-cash, Share-based Compensation Expense

For the three and six month periods ended June 30, 2020 and 2019, the Company recognized the following non-cash, share-based compensation expense in the statements of operations (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Research and development	$	4	$	22	$	13	$	45
General and administrative		—		23		7		50
Total	$	4	$	45	$	20	$	95

Summary of Stock Option Activities

Stock option transactions for the six month period ended June 30, 2020 under the Company’s stock incentive plans were as follows:

	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in years)
Options outstanding at December 31, 2019		31,136		$	84.50		6.26
Granted		—			—
Exercised	—			—
Forfeited and cancelled		(246	)		591.88
Options outstanding at June 30, 2020		30,890		$	80.46		5.81
Options exercisable at June 30, 2020		30,684		$	81.17		5.81
Options vested and expected to vest		30,890		$	80.46		5.81