Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balance at Mar. 31, 2011	$ 292,855	$ 507	$ 885,704		$ 3,817	$ (597,173)
Balance, shares at Mar. 31, 2011		50,719,000
Exercise of stock options	24		24
Exercise of stock options, shares		3,000
Issuance of common stock - ESPP	304	1	303
Issuance of common stock - ESPP, shares		89,000
Issuance of common stock - restricted shares		7	(7)
Issuance of common stock - restricted shares, shares		698,000
Stock-based compensation expense	9,864		9,864
Issuance of stock for calendar 401(k) match	720	1	719
Issuance of stock for calendar 401(k) match, shares		127,000
Contingent consideration		4	(4)
Contingent consideration shares		350,000
Treasury stock, at cost	(271)			(271)
Cumulative translation adjustment	(1,790)				(1,790)
Net loss	(136,827)					(136,827)
Balance at Mar. 31, 2012	164,879	520	896,603	(271)	2,027	(734,000)
Balance, shares at Mar. 31, 2012		51,986,000
Exercise of stock options	2		2
Issuance of common stock - ESPP	290	1	289
Issuance of common stock - ESPP, shares		100,000
Issuance of common stock - restricted shares	1,619	25	1,594
Issuance of common stock - restricted shares, shares		2,463,000
Stock-based compensation expense	8,138		8,138
Issuance of stock for calendar 401(k) match	539	2	537
Issuance of stock for calendar 401(k) match, shares		158,000
Issuance of common stock to settle liabilities	16,739	55	16,684
Issuance of common stock to settle liabilities, shares		5,593,000
Treasury stock, at cost	(42)			(42)
Cumulative translation adjustment	(887)				(887)
Net loss	(66,131)					(66,131)
Unrealized losses on investments	(28)				(28)
Balance at Mar. 31, 2013	125,118	603	923,847	(313)	1,112	(800,131)
Balance, shares at Mar. 31, 2013	60,300,466	60,300,000
Exercise of stock options, shares
Issuance of common stock - ESPP	168	1	167
Issuance of common stock - ESPP, shares		100,000
Issuance of common stock - restricted shares	502	18	484
Issuance of common stock - restricted shares, shares		1,780,000
Stock-based compensation expense	10,696		10,696
Issuance of stock for calendar 401(k) match	425	2	423
Issuance of stock for calendar 401(k) match, shares		208,000
Issuance of common stock to settle liabilities	23,480	116	23,364
Issuance of common stock to settle liabilities, shares		11,669,000
Treasury stock, at cost	(57)			(57)
Cumulative translation adjustment	727				727
Net loss	(56,258)					(56,258)
Issuance of common stock-ATM, net of costs	7,458	49	7,409
Issuance of common stock-ATM, net of costs, shares		4,873,000
Balance at Mar. 31, 2014	$ 112,259	$ 789	$ 966,390	$ (370)	$ 1,839	$ (856,389)
Balance, shares at Mar. 31, 2014	78,929,903	78,930,000