Net Loss Per Share - Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	Jun. 30, 2021
Basic net loss per share:
Net loss	$ (31,700)	$ (33,592)	$ (30,115)	$ (24,024)	$ (22,045)	$ (8,328)	$ (95,407)	$ (54,397)
Weighted average common shares outstanding —basic	20,710			20,201			20,552	20,155
Net loss per share common share—basic	$ (1.53)			$ (1.19)			$ (4.64)	$ (2.70)
Diluted net loss per share:
Net loss	$ (31,700)	$ (33,592)	$ (30,115)	$ (24,024)	$ (22,045)	$ (8,328)	$ (95,407)	$ (54,397)
Basic	20,710			20,201			20,552	20,155
Weighted average common shares outstanding —diluted	20,710			20,201			20,552	20,155
Net loss per share common share—diluted	$ (1.53)			$ (1.19)			$ (4.64)	$ (2.70)
Anti-dilutive common stock equivalents excluded from above	4,582			4,322			5,558	6,468