Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions		1 Months Ended					12 Months Ended
		Jun. 30, 2023 shares	Jun. 30, 2022 shares	Jun. 30, 2021 shares	Jun. 30, 2020 shares	Jun. 30, 2019 shares	Dec. 31, 2023 USD ($) Period $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised							0
Total intrinsic value of options exercised | $								$ 1.1	$ 7.5
Stock-based compensation, expected dividend yield							0.00%
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense expected to be recognized | $							$ 4.0
Stock-based compensation, weighted average recognition period							1 year 7 months 6 days
Stock-based compensation, expected dividend yield								0.00%	0.00%
Stock options granted							0
Weighted average grant-date fair value of stock options granted | $ / shares								$ 3.12	$ 3.51
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense expected to be recognized | $							$ 23.0
Stock-based compensation, weighted average recognition period							1 year 9 months 18 days
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, option to be granted at percentage of fair value of common stock							85.00%
Employee Stock Purchase Plan, offering period							12 months
Number of purchase periods within each offering period | Period							2
Increase in shares of common stock authorized for issuance					1,500,000
Aggregate number of shares of common stock reserved for future issuance							800,000
Stock-based compensation, expected dividend yield							0.00%	0.00%	0.00%
Weighted average grant-date fair value of awards granted | $ / shares							$ 0.88	$ 1.63	$ 2.21
2008 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, option to be granted at percentage of fair value of common stock							100.00%
Increase in shares of common stock authorized for issuance		7,000,000	12,000,000	7,600,000	5,000,000	11,800,000
Aggregate number of shares of common stock reserved for future issuance							40,200,000
Stock-based compensation, award term							10 years
Performance-based stock options, outstanding							1,600,000
Outstanding options and other stock based awards							14,515,000	15,756,000
Number of shares available for future issuance							15,000,000
2008 Equity Incentive Plan | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, vesting period							4 years
2008 Equity Incentive Plan | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unvested Restricted Stock Units							10,686,000	8,497,000
Total fair value | $							$ 8.7	$ 15.0	$ 16.1
Weighted average grant-date fair value of awards granted | $ / shares	[1]						$ 2.64
2008 Equity Incentive Plan | Performance-based Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, authorized shares for issuance							500,000
2008 Equity Incentive Plan | Performance-based Cash Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option plan granted on cash award | $							$ 1.0
2008 Equity Incentive Plan | Minimum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, vesting period							3 years
2008 Equity Incentive Plan | Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, vesting period							4 years

[1] Includes shares issuable under performance-based restricted stock unit awards.