Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands		12 Months Ended		48 Months Ended
	Aug. 20, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Commitments and Contingencies
Purchase commitment, amount		$ 844
Uncertain tax positions		233	$ 679	$ 233	$ 652
Litigation for Intellectual Property Infringement
Commitments and Contingencies
Litigation settlement	$ 4,452
Litigation Settlement, Expense				$ 13,591
Litigation expense, capitalized		$ 5,085	$ 4,698