Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 11,453,000	$ 107,359,000	$ (91,511,000)
Less income (loss) from discontinued operations	0	100,877,000	(106,069,000)
Income from continuing operations	11,453,000	6,482,000	14,558,000
Adjustments to reconcile net income from continuing operations to net cash (used in) provided by operating activities:
Depreciation	1,851,000	2,003,000	2,076,000
Amortization of intangible assets	670,000	739,000	773,000
Amortization of deferred financing cost	1,702,000	4,574,000	1,702,000
Loss due to change in fair value of warrant liability	459,000	10,443,000	389,000
Gain on extinguishment of warrant liability	0	(216,000)	0
Gain on redemption of short term investment	(4,000)	0	0
Provision for inventory reserves	1,635,000	1,620,000	1,814,000
Provision for (recovery of) customer payment discrepancies	91,000	(10,000)	536,000
Provision for (recovery of) doubtful accounts	184,000	(47,000)	166,000
Deferred income taxes	5,831,000	20,124,000	1,561,000
Share-based compensation expense	2,209,000	969,000	1,083,000
Impact of tax benefit on APIC pool from stock options exercised	0	569,000	70,000
Loss on disposal of assets	16,000	9,000	3,000
Changes in current assets and liabilities:
Accounts receivable	(2,790,000)	(18,342,000)	5,940,000
Inventory	(10,239,000)	(14,478,000)	(1,491,000)
Inventory unreturned	(299,000)	(552,000)	(1,296,000)
Prepaid expenses and other current assets	(3,451,000)	3,689,000	(4,063,000)
Other assets	(491,000)	(463,000)	(321,000)
Accounts payable and accrued liabilities	3,621,000	18,965,000	(10,300,000)
Customer finished goods returns accrual	3,427,000	1,961,000	3,242,000
Deferred core revenue	(15,065,000)	3,051,000	2,239,000
Long-term core inventory	(46,466,000)	(26,519,000)	(22,993,000)
Long-term core inventory deposits	(2,196,000)	(1,766,000)	(671,000)
Accrued core payment	37,070,000	0	0
Other liabilities	1,325,000	485,000	225,000
Net cash (used in) provided by operating activities from continuing operations	(9,457,000)	13,290,000	(4,758,000)
Net cash provided by (used in) operating activities from discontinued operations	0	227,000	(26,303,000)
Net cash (used in) provided by operating activities	(9,457,000)	13,517,000	(31,061,000)
Cash flows from investing activities:
Purchase of plant and equipment	(3,734,000)	(2,978,000)	(2,330,000)
Change in short term investments	(134,000)	(54,000)	(41,000)
Net cash used in investing activities from continuing operations	(3,868,000)	(3,032,000)	(2,371,000)
Net cash used in investing activities from discontinued operations	0	(295,000)	(1,698,000)
Net cash used in investing activities	(3,868,000)	(3,327,000)	(4,069,000)
Cash flows from financing activities:
Borrowings under revolving loan	0	10,000,000	0
Repayments under revolving loan	(10,000,000)	0	0
Proceeds from term loan	0	20,000,000	10,000,000
Repayments of term loan	(8,400,000)	(11,600,000)	(500,000)
Deferred financing costs	0	(5,221,000)	(799,000)
Payments on capital lease obligations	(64,000)	(196,000)	(289,000)
Exercise of stock options	1,247,000	5,766,000	74,000
Tax benefit from employee stock options exercised	1,131,000	(286,000)	101,000
Cash used to net share settle equity awards	(806,000)	0	(163,000)
Repurchase of common stock and options, including fees	0	(627,000)	(755,000)
Repurchase of warrants	0	(2,194,000)	0
Proceeds from issuance of common stock	71,760,000	0	15,004,000
Stock issuance costs	(4,787,000)	0	(1,034,000)
Net cash provided by financing activities from continuing operations	50,081,000	15,642,000	21,639,000
Net cash (used in) provided by financing activities from discontinued operations	0	(20,636,000)	263,000
Net cash provided by (used in) financing activities	50,081,000	(4,994,000)	21,902,000
Effect of exchange rate changes on cash	(125,000)	(31,000)	45,000
Net increase (decrease) in cash	36,631,000	5,165,000	(13,183,000)
Cash - Beginning of period from continuing operations	24,599,000	19,346,000	32,379,000
Cash - Beginning of period from discontinued operations	0	88,000	238,000
Cash - End of period	61,230,000	24,599,000	19,434,000
Less Cash - End of period from discontinued operations	0	0	88,000
Cash - End of period from continuing operations	61,230,000	24,599,000	19,346,000
Cash paid during the period for:
Interest, net	11,369,000	14,647,000	22,923,000
Income taxes, net of refunds	4,918,000	(16,472,000)	8,128,000
Non-cash investing and financing activities:
Property acquired under capital lease	274,000	303,000	155,000
Warrants issued in connection with debt	$ 0	$ 0	$ 1,625,000