Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Accrued Liabilities Current [Abstract]
Accrued professional fees	$ 270	$ 311
Accrued clinical study expense	1,876	2,839
Accrued purchases	1,389	533
Customer claim		1,000
Construction in progress		1,199
Deferred rent	125	121
Acquisition of in process research and development	965
Other	472	262
Total	$ 5,097	$ 6,265