Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases right-of-use assets		$ 22,276
Operating lease liabilities - current		1,768
Operating lease liabilities - long-term		21,686
Accumulated deficit		33,805			$ 39,555
Gain recognized on lease modification		121	$ 0
Operating lease liability		23,454
Increase to right-of-use assets		24,700
Increase to lease liabilities		$ 25,200
Facilities and Equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease term		9 months 18 days
Facilities and Equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease term		10 years 9 months 18 days
Lease Modification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases right-of-use assets		$ 7,300
Gain recognized on lease modification	$ 100
Operating lease liability		$ 7,200
Cumulative-effect adjustment for adoption of ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases right-of-use assets				$ 17,398
Operating lease liabilities - current				3,645
Operating lease liabilities - long-term				14,372
Accumulated deficit				2
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases right-of-use assets				17,400
Operating lease liability				$ 18,000