CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2018	May 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 8,511	$ (2,654)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation expense	2,043	2,025
Intangible assets amortization expense	2,748	3,858
Stock-based compensation expense	2,467	1,817
Tax benefits on vested and exercised equity awards	220	157
Amortization of convertible debt issue costs and discount	1,931	1,816
Unrealized foreign currency transaction losses	137
Deferred tax assets, net	772	(1,609)
Equity in net loss of affiliate	439	337
Other	(99)	(319)
Changes in operating assets and liabilities:
Accounts receivable	1,621	2,070
Inventories	3,585	(3,348)
Prepaid expenses and other assets	(1,255)	1,069
Accounts payable	7,538	3,262
Accrued liabilities	(1,369)	1,344
Deferred revenue	1,623	1,083
NET CASH PROVIDED BY OPERATING ACTIVITIES	30,912	10,908
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities of marketable securities	23,507	6,722
Purchases of marketable securities	(9,262)	(546)
Capital expenditures	(2,121)	(2,079)
Other	(26)	(69)
NET CASH PROVIDED BY INVESTING ACTIVITIES	12,098	4,028
CASH FLOWS FROM FINANCING ACTIVITIES:
Repurchases of common stock	(5,710)
Taxes paid related to net share settlement of vested equity awards	(233)	(156)
Proceeds from exercise of stock options	68	96
NET CASH USED IN FINANCING ACTIVITIES	(5,875)	(60)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(229)	108
Net change in cash and cash equivalents	36,906	14,984
Cash and cash equivalents at beginning of period	132,603	93,706
Cash and cash equivalents at end of period	$ 169,509	$ 108,690