Valuation Allowances on Deferred Tax Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 101,332	$ 96,777
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	6,931	9,582
Deferred Tax Assets, Valuation Allowance	$ 69,678	$ 62,639
Loss Generated Through 2016 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Statutory Carryforward Period	12 years
Loss Generated After 2017 [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Limit of Taxable Income, Tax Reform Act, Provisions in Effect	80.00%
Minimum [Member] | Loss Generated Through 2017 [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2030
Minimum [Member] | Loss Generated Through 2016 [Member] | Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2029