Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Accrued Liabilities Current [Abstract]
Accrued professional fees	$ 327	$ 311
Accrued clinical study expense	976	2,839
Accrued purchases	1,146	533
Acquisition of in process research and development	977
Deferred rent	128	121
Customer claim		1,000
Construction in progress		1,199
Other	305	262
Total	$ 3,859	$ 6,265