Unaudited Consolidated Statement of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Total
Balance at Jun. 30, 2019	$ 53	$ 207,982	$ 99,817	$ 112	$ 307,964
Balance (in shares) at Jun. 30, 2019	53,075
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		26,140			26,140
Stock options exercised		389			389
Stock options exercised (in shares)	23
Issuance of common stock upon vesting of restricted stock units	$ 1	(1)
Issuance of common stock upon vesting of restricted stock units (in shares)	688
Issuance of common stock under employee stock purchase plan		3,961			3,961
Issuance of common stock under employee stock purchase plan (in shares)	45
Net settlement for taxes and/or exercise price related to equity awards		(26,231)			(26,231)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(258)
Unrealized losses on securities, net of tax				(32)	(32)
Net income			19,373		19,373
Balance at Dec. 31, 2019	$ 54	212,240	119,190	80	331,564
Balance (in shares) at Dec. 31, 2019	53,573
Balance at Sep. 30, 2019	$ 54	195,566	113,723	116	309,459
Balance (in shares) at Sep. 30, 2019	53,511
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		13,422			13,422
Stock options exercised		269			269
Stock options exercised (in shares)	15
Issuance of common stock upon vesting of restricted stock units (in shares)	11
Issuance of common stock under employee stock purchase plan		3,961			3,961
Issuance of common stock under employee stock purchase plan (in shares)	45
Net settlement for taxes and/or exercise price related to equity awards		(978)			(978)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(9)
Unrealized losses on securities, net of tax				(36)	(36)
Net income			5,467		5,467
Balance at Dec. 31, 2019	$ 54	212,240	119,190	80	331,564
Balance (in shares) at Dec. 31, 2019	53,573
Balance at Jun. 30, 2020	$ 54	227,907	164,272	675	$ 392,908
Balance (in shares) at Jun. 30, 2020	53,792				53,792
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		32,233			$ 32,233
Stock options exercised		1,932			1,932
Stock options exercised (in shares)	234
Issuance of common stock upon vesting of restricted stock units (in shares)	608
Issuance of common stock under employee stock purchase plan		6,100			6,100
Issuance of common stock under employee stock purchase plan (in shares)	60
Net settlement for taxes and/or exercise price related to equity awards		(46,647)			(46,647)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(324)
Unrealized losses on securities, net of tax				(411)	(411)
Currency translation adjustments				1	1
Net income			22,102		22,102
Balance at Dec. 31, 2020	$ 54	221,525	186,374	265	$ 408,218
Balance (in shares) at Dec. 31, 2020	54,370				54,370
Balance at Sep. 30, 2020	$ 54	209,582	176,732	452	$ 386,820
Balance (in shares) at Sep. 30, 2020	54,223
Increase (Decrease) in Stockholders' Equity
Stock-based compensation		17,187			17,187
Stock options exercised		1,403			1,403
Stock options exercised (in shares)	146
Issuance of common stock upon vesting of restricted stock units (in shares)	9
Issuance of common stock under employee stock purchase plan		6,100			6,100
Issuance of common stock under employee stock purchase plan (in shares)	60
Net settlement for taxes and/or exercise price related to equity awards		(12,747)			(12,747)
Net settlement for taxes and/or exercise price related to equity awards (in shares)	(68)
Unrealized losses on securities, net of tax				(188)	(188)
Currency translation adjustments				1	1
Net income			9,642		9,642
Balance at Dec. 31, 2020	$ 54	$ 221,525	$ 186,374	$ 265	$ 408,218
Balance (in shares) at Dec. 31, 2020	54,370				54,370