Related Party Transactions - Schedule of Expenses Incurred (Details) - Dow - USD ($) $ in Thousands		12 Months Ended
	Jul. 31, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Payment amount for services	$ 5,000	$ 40	$ 120	$ 1,819
Ongoing costs of the transition services agreement / Other
Related Party Transaction [Line Items]
Payment amount for services		40	120	335
Other expenses | Ongoing costs of the transition services agreement / Other
Related Party Transaction [Line Items]
Payment amount for services		$ 0	$ 0	$ 1,484