Income Taxes (Summary of Operating Loss Carryforwards and Tax Credit Carryforwards) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	$ 12,812	$ 8,531
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,807
Total net deferred tax asset	16,691	11,959
Total valuation allowance	8,520	6,459
Foreign tax authority
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	915	772
Valuation allowance, net operating loss	915	772
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
Net deferred tax asset, net operating loss	11,098	9,791
Valuation allowance, net operating loss	7,605	5,687
Net deferred tax asset, tax credit	1,871	1,396
Valuation allowance, tax credit	$ 0	$ 0