Related Party Transactions (Details) - Commercial Services Agreement - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2015
Related Party Transactions
Other income	$ 0.8
Related party, fair value of contingent liability	$ 0.0
Investor
Related Party Transactions
Contingent liability due to related party		$ 1.5

Amount of revenue and income classified as other.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.4)
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Name:	us-gaap_OtherIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration