Related Party Transactions - Schedule of Expenses Incurred (Details) - Dow - USD ($) $ in Thousands		12 Months Ended
	Jul. 31, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Payment amount for services	$ 5,000	$ 120	$ 1,819	$ 5,138
Amortization of prepayment related to set-up of transition services
Related Party Transaction [Line Items]
Payment amount for services		0	0	827
Ongoing costs of the transition services agreement / Rent and Other
Related Party Transaction [Line Items]
Payment amount for services		120	335	2,970
Rent expense | Ongoing costs of the transition services agreement / Rent and Other
Related Party Transaction [Line Items]
Payment amount for services		0	0	902
Other expenses | Ongoing costs of the transition services agreement / Rent and Other
Related Party Transaction [Line Items]
Payment amount for services		$ 0	$ 1,484	$ 439