Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]
Beginning Balance at Jun. 30, 2017	$ 118,082	$ 45		$ 263,533	$ (463)	$ (145,033)
Beginning Balance, Shares at Jun. 30, 2017		45,435,836
Issuance of common stock upon exercise of stock options	3,169			3,169
Issuance of common stock upon exercise of stock options, Shares		482,279
Release of restricted stock, net of share settlement		$ 2		(2)
Release of restricted stock, net of share settlement, Shares		1,157,526
Repurchase of common stock	(648)		$ (648)
Repurchase of common stock, Shares			(93,341)
Retirement of treasury stock			$ 648	(648)
Retirement of treasury stock, Shares		(93,341)	93,341
Stock-based compensation expense	7,668			7,668
Withholding taxes related to release of restricted stock, net of share settlement	(5,119)			(5,119)
Net income	10,509					10,509
Other comprehensive income	5				5
Ending Balance at Mar. 31, 2018	133,666	$ 47		268,601	(458)	(134,524)
Ending Balance, Shares at Mar. 31, 2018		46,982,300
Beginning Balance at Dec. 31, 2017	124,907	$ 46		266,982	(480)	(141,641)
Beginning Balance, Shares at Dec. 31, 2017		46,220,880
Issuance of common stock upon exercise of stock options	2,271			2,271
Issuance of common stock upon exercise of stock options, Shares		301,104
Release of restricted stock, net of share settlement		$ 1		(1)
Release of restricted stock, net of share settlement, Shares		460,316
Stock-based compensation expense	2,633			2,633
Withholding taxes related to release of restricted stock, net of share settlement	(3,284)			(3,284)
Net income	7,117					7,117
Other comprehensive income	22				22
Ending Balance at Mar. 31, 2018	133,666	$ 47		268,601	(458)	(134,524)
Ending Balance, Shares at Mar. 31, 2018		46,982,300
Beginning Balance at Jun. 30, 2018	$ 148,326	$ 48		277,761	(380)	(129,103)
Beginning Balance, Shares at Jun. 30, 2018	48,146,384	48,146,384
Issuance of common stock upon exercise of stock options	$ 5,629	$ 1		5,628
Issuance of common stock upon exercise of stock options, Shares		814,069
Release of restricted stock, net of share settlement		$ 1		(1)
Release of restricted stock, net of share settlement, Shares		1,087,188
Stock-based compensation expense	9,994			9,994
Withholding taxes related to release of restricted stock, net of share settlement	(8,783)			(8,783)
Net income	59,064					59,064
Other comprehensive income	23				23
Ending Balance at Mar. 31, 2019	$ 214,253	$ 50		284,599	(357)	(70,039)
Ending Balance, Shares at Mar. 31, 2019	50,047,641	50,047,641
Beginning Balance at Dec. 31, 2018	$ 211,206	$ 50		282,493	(357)	(70,980)
Beginning Balance, Shares at Dec. 31, 2018		49,771,433
Issuance of common stock upon exercise of stock options	505			505
Issuance of common stock upon exercise of stock options, Shares		112,683
Release of restricted stock, net of share settlement, Shares		163,525
Stock-based compensation expense	2,966			2,966
Withholding taxes related to release of restricted stock, net of share settlement	(1,365)			(1,365)
Net income	941					941
Ending Balance at Mar. 31, 2019	$ 214,253	$ 50		$ 284,599	$ (357)	$ (70,039)
Ending Balance, Shares at Mar. 31, 2019	50,047,641	50,047,641