Stockholders' Equity - Summary of Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Jun. 30, 2022 $ / shares shares
Class of Stock [Line Items]
Number of stock options outstanding	8,810,000
Stock options exercisable	4,611,000
Exercise Price One [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 0.33
Number of stock options outstanding	10,000
Weighted average remaining contractual life (years)	9 years 8 months 19 days
Exercise Price Two [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 0.61
Number of stock options outstanding	816,000
Weighted average remaining contractual life (years)	3 years 6 months 7 days
Stock options exercisable	799,000
Exercise Price Three [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 0.74
Number of stock options outstanding	250,000
Weighted average remaining contractual life (years)	7 years 4 months 17 days
Stock options exercisable	146,000
Exercise Price Four [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 0.96
Number of stock options outstanding	3,519,000
Weighted average remaining contractual life (years)	9 years 4 months 9 days
Exercise Price Five [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 1.24
Number of stock options outstanding	335,000
Weighted average remaining contractual life (years)	9 years 2 months 26 days
Stock options exercisable	251,000
Exercise Price Six [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 1.36
Number of stock options outstanding	300,000
Weighted average remaining contractual life (years)	8 years 2 months 26 days
Stock options exercisable	175,000
Exercise Price Seven [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 1.37
Number of stock options outstanding	75,000
Weighted average remaining contractual life (years)	8 years 10 months 2 days
Stock options exercisable	25,000
Exercise Price Eight [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 1.70
Number of stock options outstanding	3,282,000
Weighted average remaining contractual life (years)	3 years 18 days
Stock options exercisable	2,992,000
Exercise Price Nine [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 6.10
Number of stock options outstanding	17,000
Weighted average remaining contractual life (years)	6 years 4 months 9 days
Stock options exercisable	17,000
Exercise Price Ten [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 8.70
Number of stock options outstanding	12,000
Weighted average remaining contractual life (years)	7 months 24 days
Stock options exercisable	12,000
Exercise Price Eleven [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 9.83
Number of stock options outstanding	83,000
Weighted average remaining contractual life (years)	7 months 24 days
Stock options exercisable	83,000
Exercise Price Twelve [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 10.60
Number of stock options outstanding	4,000
Weighted average remaining contractual life (years)	5 years 9 months 14 days
Stock options exercisable	4,000
Exercise Price Thirteen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 11.70
Number of stock options outstanding	30,000
Weighted average remaining contractual life (years)	7 months 28 days
Stock options exercisable	30,000
Exercise Price Fourteen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 21.10
Number of stock options outstanding	7,000
Weighted average remaining contractual life (years)	2 years 10 months 2 days
Stock options exercisable	7,000
Exercise Price Fifteen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 29.60
Number of stock options outstanding	2,000
Weighted average remaining contractual life (years)	2 years 7 months 9 days
Stock options exercisable	2,000
Exercise Price Sixteen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 37.60
Number of stock options outstanding	5,000
Weighted average remaining contractual life (years)	3 years 7 months 13 days
Stock options exercisable	5,000
Exercise Price Seventeen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 41.00
Number of stock options outstanding	4,000
Weighted average remaining contractual life (years)	4 years 4 months 13 days
Stock options exercisable	4,000
Exercise Price Eighteen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 42.00
Number of stock options outstanding	30,000
Weighted average remaining contractual life (years)	1 year 1 month 17 days
Stock options exercisable	30,000
Exercise Price Nineteen [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 44.80
Number of stock options outstanding	3,000
Weighted average remaining contractual life (years)	3 years 7 months 13 days
Stock options exercisable	3,000
Exercise Price Twenty [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 49.50
Number of stock options outstanding	13,000
Weighted average remaining contractual life (years)	4 years 7 months 20 days
Stock options exercisable	13,000
Exercise Price Twenty One [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 53.20
Number of stock options outstanding	8,000
Weighted average remaining contractual life (years)	3 years 10 months 6 days
Stock options exercisable	8,000
Exercise Price Twenty Two [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 61.60
Number of stock options outstanding	2,000
Weighted average remaining contractual life (years)	9 months
Stock options exercisable	2,000
Exercise Price Twenty Three [Member]
Class of Stock [Line Items]
Exercise price | $ / shares	$ 92.00
Number of stock options outstanding	3,000
Weighted average remaining contractual life (years)	11 months 1 day
Stock options exercisable	3,000