Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Income Tax Disclosure [Abstract]
Tax expense (benefit) at federal statutory rate	$ 7,696	$ (2,502)	$ (1,608)
State taxes, net of federal benefit	1,071	(363)	4,845
Non-deductible expenses	295	368	823
Stock-based compensation	1,241	2,134	520
Transaction costs	179	732	(1,454)
Change in valuation allowance	3,291	1,674	58,685
Foreign rate differential	941	(2,752)	2,730
Research and development credits	(1,995)	(2,482)	(1,792)
Domestic production activities deduction	(769)	(63)	0
Litigation settlements	0	584	0
Other	(197)	(57)	153
Provision for (benefit from) income taxes	$ 11,753	$ (2,727)	$ 62,902