Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Oct. 01, 2019	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases right-of-use assets	$ 23,716		$ 17,398
Operating leases liabilities - current	1,723		3,645
Operating leases liabilities - long-term	22,553		14,372
Accumulated deficit	38,006		39,557	$ 39,555
Gain recognized on lease modification	121	$ 0
Operating lease liability	$ 24,276
Facilities and Equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease term	3 months 18 days
Facilities and Equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining lease term	11 years 3 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
ASC 842 Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases right-of-use assets			17,398
Operating leases liabilities - current			3,645
Operating leases liabilities - long-term			14,372
Accumulated deficit			2
Operating lease liability			$ 18,000