Income taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carryforwards	$ 8,809	$ 8,325
Equity-based compensation	1,275	1,237
Tax credit carryforwards	148	148
Accrued compensation	305	369
Accrued liabilities & other	105	113
Gross deferred tax assets	10,642	10,192
Less: valuation allowance	(9,850)	(9,138)
Deferred tax assets after valuation allowance	792	1,054
Deferred tax liabilities:
Intangible assets	(784)	(1,043)
Others	(8)	(11)
Deferred tax liabilities	(792)	(1,054)
Net Deferred tax assets