Amount of lessee's undiscounted obligation for lease payments for operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Name:	us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Subsequent Event (Details) - USD ($) $ in Thousands	Aug. 01, 2019	Jun. 30, 2019
Subsequent Event [Line Items]
Future minimum lease payments under operating lease		$ 3,088
Office Space \| Subsequent Event
Subsequent Event [Line Items]
Future minimum lease payments under operating lease	$ 4,000