Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Income Taxes Operating Loss Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, research and development	$ 300
Valuation allowance	1,772	$ 782
Missouri Tax Authority [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	37,100
Connecticut Tax Authority [Member] \| State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	4,500
Japanese Tax Authority [Member] \| Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	3,800
Mexican Tax Authority [Member] \| Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,500
Canada Revenue Agency [Member] \| Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 200