Related Party - Line of Credit Commitment (Details) - Able N.V. € in Millions, $ in Millions	1 Months Ended
	Aug. 31, 2017 EUR (€) payment $ / €	Aug. 31, 2017 USD ($) payment $ / €	Dec. 31, 2018 USD ($)
Transition services agreement
Line of credit information
Transition services agreement, term	3 months	3 months
Line of credit
Line of credit information
Line of credit commitment	€ 1.5	$ 1.8
Exchange rate (in dollars per Euro) | $ / €	1.18	1.18
Interest rate, fixed percentage	2.00%	2.00%
Period for advances	18 months	18 months
Number of quarterly repayments | payment	12	12
Amounts advanced | $			$ 0.0