Share-Based Compensation - 2019 Employee Stock Purchase Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Jul. 24, 2019
Employee stock purchase plan
Expense recognized related to plan	$ 0
ESPP
Employee stock purchase plan
Number of common shares reserved for sale		1,000,000

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant