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Stockholders' Equity - Narrative (Details)		3 Months Ended		6 Months Ended		12 Months Ended
Stockholders' Equity - Narrative (Details)	Nov. 06, 2018 $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares	Dec. 16, 2020 USD ($) $ / shares shares	Sep. 30, 2020 $ / shares shares	Jan. 31, 2020 shares	Dec. 13, 2019 USD ($)	Feb. 28, 2019	Oct. 23, 2018 $ / right $ / shares shares	Mar. 07, 2018 shares	Mar. 10, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		$ 22,800,000		$ 22,800,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 4 months 24 days
Purchase of common stock (in shares)		902,640		902,640			1,162,505
Discount rate from market price, purchase date				0.15
Recognized compensation expense \| $		$ 2,968,000	$ 2,308,000	$ 5,715,000	$ 4,611,000
Total intrinsic value of options exercised \| $				$ 1,400,000	$ 1,000,000.0
Options granted (in shares)				0
Weighted-average fair value of options granted (in dollars per share) \| $ / shares				$ 0	$ 4.32
Amount authorized and approved under share repurchase program \| $									$ 10,000,000
Amount of shares repurchased \| $						$ 1,000,000.0
Number of shares repurchased (in shares)						137,000
Average price of shares repurchased (in dollars per share) \| $ / shares						$ 7.33
Preferred stock, par value (in dollars per share) \| $ / shares		$ 0.001		$ 0.001			$ 0.001
Percentage of common stock outstanding for acquiring person under right agreement										4.90%
Series B Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of preferred share purchase right for each share of common stock (in shares)											1
Preferred stock, share conversion ratio											0.001000
Preferred stock, par value (in dollars per share) \| $ / shares											$ 0.001
Preferred stock, purchase price per right (in dollars per right) \| $ / right											35.00
Preferred stock, redemption price per share (in dollars per share) \| $ / shares											$ 0.0001
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 4 months 24 days
Awards outstanding (in shares)		2,445,300		2,445,300			2,661,943
Recognized compensation expense \| $		$ 2,100,000	1,700,000	$ 4,000,000.0	$ 3,400,000
Unrecognized compensation expense related to nonvested awards \| $		17,600,000		17,600,000
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		$ 3,300,000		$ 3,300,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years 6 months
Awards outstanding (in shares)		547,976		547,976			353,556
Recognized compensation expense \| $		$ 300,000	100,000	$ 600,000	300,000
Stock performance shares resulting in vesting (in shares)		117,848
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				2 years
Recognized compensation expense \| $		$ 200,000	200,000	$ 400,000	300,000
Unrecognized compensation expense related to outstanding stock options \| $		1,300,000		1,300,000
Performance options \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		500,000		$ 500,000
Weighted average period for unrecognized compensation expense expected to be recognized (in years)				7 months 6 days
Number of common stock reserved for future grants (in shares)	800,000
Recognized compensation expense \| $		$ 200,000	200,000	$ 400,000	400,000
Exercise price per share (in dollars per share) \| $ / shares	$ 9.50
Vesting period of awards	3 years
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)								4,500,000
Number of common stock reserved for future grants (in shares)		2,758,605		2,758,605
2020 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		873,211		873,211
2020 Plan \| Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		547,976		547,976
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)								107,903
Purchase of common stock (in shares)		592,851		592,851
Prior Plans \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		1,184,531		1,184,531
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		572,331		572,331								1,000,000
Shares issued to participants pursuant to employee stock purchase plan (in shares)				427,669
Discount rate from market price, offering date				15.00%
Recognized compensation expense \| $		$ 200,000	$ 200,000	$ 300,000	$ 200,000
Director Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)													1,500,000
Number of common stock reserved for future grants (in shares)		220,361		220,361
Director Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of common stock (in shares)		328,346		328,346