Warrants - Exercise of Warrants (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Class of Warrant or Right [Line Items]
Proceeds from exercise of warrants	$ 3	$ 1,117
Series 2020-A Warrants
Class of Warrant or Right [Line Items]
Common stock Issued upon exercise of warrants (in shares)	4,677
Proceeds from exercise of warrants	$ 3

The cash inflow associated with the amount received from holders exercising their stock warrants.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromWarrantExercises
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration