Rights Offering - Pro Forma Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash	$ 5,311			$ 5,446
Deferred offering costs	457			0
Other current assets	56			62
Total assets	5,824			6,478
Current liabilities:
Commitments and contingencies	0			0
Stockholders' equity
Preferred stock - $0.01 par value, 2,960,000 shares authorized; no shares issued and outstanding	0			0
Common stock - $.01 par value, 74,214,603 shares authorized, issued, and outstanding	442			442
Additional paid-in capital	75,690			75,690
Accumulated deficit	(70,962)			(70,077)
Total stockholders' equity	5,170	$ 5,577	$ 5,813	6,055	$ 6,317	$ 11,948	$ 11,969	$ 14,993
Total liabilities, mezzanine equity and stockholders' equity	5,824			$ 6,478
As reported
Current assets:
Cash	5,311
Deferred offering costs	457
Other current assets	56
Total assets	5,824
Current liabilities:
Accounts payable, accrued expenses and other current liabilities	654
Total liabilities	654
Commitments and contingencies	0
Mezzanine equity
Series C preferred stock - $1,000 par value, 40,000 shares authorized, issued, and outstanding (liquidation value $40,000)	0
Stockholders' equity
Preferred stock - $0.01 par value, 2,960,000 shares authorized; no shares issued and outstanding	0
Common stock - $.01 par value, 74,214,603 shares authorized, issued, and outstanding	442
Additional paid-in capital	75,690
Accumulated deficit	(70,962)
Total stockholders' equity	5,170
Total liabilities, mezzanine equity and stockholders' equity	5,824
Pro Forma Adjustments
Current assets:
Cash	43,600
Deferred offering costs	(457)
Other current assets	56
Total assets	43,143
Current liabilities:
Accounts payable, accrued expenses and other current liabilities	0
Total liabilities	0
Commitments and contingencies	0
Mezzanine equity
Series C preferred stock - $1,000 par value, 40,000 shares authorized, issued, and outstanding (liquidation value $40,000)	40,000
Stockholders' equity
Preferred stock - $0.01 par value, 2,960,000 shares authorized; no shares issued and outstanding	0
Common stock - $.01 par value, 74,214,603 shares authorized, issued, and outstanding	300
Additional paid-in capital	2,843
Accumulated deficit	0
Total stockholders' equity	3,143
Total liabilities, mezzanine equity and stockholders' equity	43,143
Pro Forma
Current assets:
Cash	48,911
Deferred offering costs	0
Other current assets	0
Total assets	48,967
Current liabilities:
Accounts payable, accrued expenses and other current liabilities	654
Total liabilities	654
Commitments and contingencies	0
Mezzanine equity
Series C preferred stock - $1,000 par value, 40,000 shares authorized, issued, and outstanding (liquidation value $40,000)	40,000
Stockholders' equity
Preferred stock - $0.01 par value, 2,960,000 shares authorized; no shares issued and outstanding	0
Common stock - $.01 par value, 74,214,603 shares authorized, issued, and outstanding	742
Additional paid-in capital	78,533
Accumulated deficit	(70,962)
Total stockholders' equity	8,313
Total liabilities, mezzanine equity and stockholders' equity	$ 48,967