Income Taxes, Deferred Taxes and Other Information (Details) $ in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 AUD ($)
Noncurrent [Abstract]
Accrued leave	$ 61	$ 51
Other accrued expenses	0	0
Stock based compensation	293	449
Net operating loss carryforward	37,665	44,572
Other	11	69
Intangibles	751	809
R&D credit carryforward	531	531
Total deferred tax assets	39,312	46,481
Less: valuation allowance	(39,312)	(46,481)
Total	0	0
Operating Loss Carryforwards [Abstract]
Increase (decrease) in valuation allowance	(7,200)	3,400
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	$ 168,200
Net operating loss (NOL) carryforwards with expiration date	120,100
Net operating loss (NOL) carryforwards with no expiration date	48,100
State [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards	$ 30,900
Australian [Member]
Operating Loss Carryforwards [Abstract]
Net operating loss (NOL) carryforwards			$ 0