Valuation Allowances on Deferred Tax Assets and Tax Legislation Developments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Domestic net operating loss carryforward	$ 110,167	$ 102,827
Foreign net operating loss carryforward	5,826	8,007
Deferred Tax Assets, Valuation Allowance	$ 68,500	$ 59,800
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