Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Balance at Mar. 31, 2016	$ 269,377	$ 610	$ 211,262	$ 57,986	$ (481)
Balance, Shares at Mar. 31, 2016		60,978
Common stock issued under stock plans, net of shares withheld for taxes	1,310	$ 11	1,299
Common stock issued under stock plans, net of shares withheld for taxes, Shares		1,043
Common stock issued for earnout settlement	9,273	$ 4	9,269
Common stock issued for earnout settlement, Shares		434
Tax benefit related to stock options	(879)		(879)
Stock-based compensation	7,598		7,598
Other comprehensive income:
Unrealized gain on marketable securities	43				43
Foreign currency translation, net of tax	80				80
Net income	18,241			18,241
Balance at Mar. 31, 2017	305,043	$ 625	228,549	76,227	(358)
Balance, Shares at Mar. 31, 2017		62,455
Common stock issued under stock plans, net of shares withheld for taxes	3,833	$ 15	3,818
Common stock issued under stock plans, net of shares withheld for taxes, Shares		1,540
Stock-based compensation	12,196		12,196
Cumulative effect adjustment related to the adoption of ASU 2016-09	(40)		(101)	61
Other comprehensive income:
Foreign currency translation, net of tax	(42)				(42)
Net income	2,420			2,420
Balance at Mar. 31, 2018	323,410	$ 640	244,462	78,708	(400)
Balance, Shares at Mar. 31, 2018		63,995
Common stock issued under stock plans, net of shares withheld for taxes	4,352	$ 8	4,344
Common stock issued under stock plans, net of shares withheld for taxes, Shares		843
Stock-based compensation	16,102		16,102
Cumulative effect adjustment related to the adoption of ASU 2016-09	8,419			8,419
Other comprehensive income:
Foreign currency translation, net of tax	(831)				(831)
Net income	24,494			24,494
Balance at Mar. 31, 2019	$ 375,946	$ 648	$ 264,908	$ 111,621	$ (1,231)
Balance, Shares at Mar. 31, 2019		64,838