Income taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Taxes [Abstract]

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2015			2014
U.S. federal tax loss carry–forward	$	14,229		$	10,779
U.S. State tax loss carry–forward		1,137			1,498
U.S. federal capital loss carry–forward		188			188
U.S. foreign tax credit carry–forward		–			–
Equity–based compensation, fixed assets and other		–			1,598
Total deferred tax assets		15,554			14,063
Less: valuation allowance		(15,554	)		(14,063	)
Net deferred tax asset	$	–		$	–

Summary of Operating Loss Carryforwards [Table Text Block]

	Amount		Begins to expire
U.S. federal net operating loss carry–forwards	$	36,306		Fiscal 2023
U.S. State net operating loss carry–forwards		20,739		Fiscal 2031
U.S. federal capital loss carry–forwards		553		Fiscal 2015

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2015			2014
Expected Federal Tax		(34.00	)%		(34.00	)%
State Tax (Net of Federal Benefit)		(5.48	)		(5.48	)
Permanent differences		—			0.12
Loss of NOL benefit of closed foreign entity		—			—
Write–off of deferred tax asset		—			4.29
Adjustments to deferred tax balances		—			(8.34	)
Foreign tax credit		—			—
Other		—			0.05
Change in valuation allowance		39.48			43.36
Effective rate of income tax		0	%		0	%