Income Taxes, Deferred Taxes and Other Information (Details) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 AUD ($)	Dec. 31, 2018 USD ($)
Noncurrent [Abstract]
Accrued leave	$ 51		$ 50
Other accrued expenses	0		0
Stock based compensation	449		483
Net operating loss carryforward	44,572		41,032
Other	69		125
Intangibles	809		847
R&D credit carryforward	531		531
Total deferred tax assets	46,481		43,068
Less: valuation allowance	(46,481)		(43,068)
Total	0		0
Unrecognized Tax Benefits [Abstract]
Uncertain tax positions	0		0
Penalties and Interest Accrued [Abstract]
Interest and penalties accrued on uncertain tax positions	$ 0		$ 0
Earliest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards, expiration date	Dec. 31, 2024
Latest Tax Year [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards, expiration date	Dec. 31, 2037
Federal [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards	$ 152,100
Net operating loss (NOL) carryforwards with expiration date	120,100
Net operating loss (NOL) carryforwards with no expiration date	32,000
State [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards	$ 30,100
Australian [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards		$ 49.0