Summary of Significant Accounting Policies - ASC 606 - Cumulative Effect - Accumulated Deficit (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 01, 2018	Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect adjustment, increase to the opening accumulated deficit		$ 859
Registration fees benefit period	24 months
Customer life period	60 months
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect adjustment, increase to the opening accumulated deficit	$ 900
Cumulative effect adjustment, increase to the opening accumulated deficit, tax	400
Cumulative effect on accumulated deficit, net of tax, effect of acceleration of revenue	900
Cumulative effect on accumulated deficit, net of tax, effect of deferral of registration fee	3,100
Cumulative effect on accumulated deficit, net of tax, effect of deferral of commission expense	1,500
Cumulative effect on accumulated deficit, net of tax, effect of additional performance obligation	200
Accounting Standards Update 2014-09 | Discontinued Operations, Held-for-sale
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative effect on accumulated deficit, net of tax, effect of additional performance obligation	$ 200