Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 5,193	$ 7,925
Other assets	0	65
Total assets	5,193	7,990
Liabilities:
Accounts payable and accrued liabilities	455	383
Total liabilities	455	383
Commitments and contingencies (Note 6)
Stockholders' equity:
Common stock ($0.01 par value, 85,000 authorized - 2021 and 85,000 authorized - 2020, 46,410 issued and 40,738 outstanding - 2021 and 46,410 issued and 40,738 outstanding - 2020)	464	464
Additional paid-in capital	548,304	548,304
Accumulated deficit	(538,862)	(535,993)
Treasury stock, at cost - 2021 - 5,672 shares; and 2020 - 5,672 shares	(5,168)	(5,168)
Total stockholders' equity	4,738	7,607
Total liabilities and stockholders' equity	$ 5,193	$ 7,990