Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards					$ 9,700
Proceeds from Income Tax Refunds	$ 3,200
Other Tax Expense (Benefit)	$ 1,400
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%		35.00%
Deferred Tax Assets, Other	$ 1,800
Income tax expense (benefit) [Abstract]
Federal current	57	$ 0
Federal deferred	(1,099)	193
Foreign current	688	120
Foreign deferred	1,037	115
State current	9	19
State deferred	64	92
Total income tax expense	756	$ 539
Deferred tax assets:
Deferred Tax Assets, Gross	5,744			$ 7,793
Valuation allowances	(2,772)			(2,761)
Net deferred tax assets	2,972			5,032
Deferred tax liabilities:
Deferred tax liabilities	5,939			4,449
State Administration of Taxation, China [Member]
Income tax expense (benefit) [Abstract]
Foreign deferred	$ 1,100
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent	10.00%
Domestic Country [Member]
Deferred tax assets:
Deferred Tax Assets, Gross	$ 2,310			4,385
Deferred tax liabilities:
Tax Credit Carryforward, Amount	3,000			4,400
Foreign Country [Member]
Deferred tax assets:
Deferred Tax Assets, Gross	2,111			2,020
Valuation allowances	(1,700)			(1,700)
Deferred tax liabilities:
Deferred tax liabilities	5,939			4,449
State and Local Jurisdiction [Member]
Deferred tax assets:
Deferred Tax Assets, Gross	1,323			1,388
Valuation allowances	$ (1,100)			$ (1,100)