Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 37,573,000	$ 10,563,000	$ 11,453,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	3,101,000	2,315,000	1,851,000
Amortization of intangible assets	613,000	621,000	670,000
Amortization of debt issuance costs	716,000	790,000	1,702,000
Write-off of debt issuance costs	0	5,108,000	0
Amortization of interest on accrued core payment	704,000	736,000	0
(Gain) loss due to the change in the fair value of the warrant liability	(3,764,000)	5,137,000	459,000
Gain due to the change in the fair value of the contingent consideration	(16,000)	(990,000)	0
Gain on redemption of short-term investment	0	0	(4,000)
Net provision for inventory reserves	3,864,000	4,518,000	1,635,000
Net provision for (recovery of) customer payment discrepancies	718,000	(299,000)	91,000
Net provision for doubtful accounts	3,000	4,404,000	184,000
Deferred income taxes	6,510,000	(3,781,000)	5,831,000
Share-based compensation expense	3,383,000	2,584,000	2,209,000
Loss on disposal of plant and equipment	13,000	7,000	16,000
Change in operating assets and liabilities:
Accounts receivable	(18,145,000)	4,647,000	(2,790,000)
Inventory	(10,058,000)	3,054,000	(10,239,000)
Inventory unreturned	2,939,000	(2,687,000)	(299,000)
Prepaid expenses and other current assets	(4,333,000)	2,765,000	(3,451,000)
Other assets	(3,339,000)	(477,000)	(491,000)
Accounts payable and accrued liabilities	12,446,000	6,620,000	3,621,000
Customer finished goods returns accrual	(8,709,000)	6,698,000	3,427,000
Deferred core revenue	0	0	(15,065,000)
Long-term core inventory	(24,964,000)	(53,408,000)	(46,466,000)
Long-term core inventory deposits	0	26,002,000	(2,196,000)
Accrued core payment	(3,180,000)	(11,266,000)	37,070,000
Other liabilities	(1,344,000)	1,673,000	1,325,000
Net cash (used in) provided by operating activities	(5,269,000)	15,334,000	(9,457,000)
Cash flows from investing activities:
Purchase of plant and equipment	(4,929,000)	(3,747,000)	(3,734,000)
Purchase of business	(705,000)	(2,701,000)	0
Additions to short term investments	(49,000)	(1,134,000)	(134,000)
Net cash used in investing activities	(5,683,000)	(7,582,000)	(3,868,000)
Cash flows from financing activities:
Borrowings under revolving loan	65,001,000	29,000,000	0
Repayments under revolving loan	(61,001,000)	(22,000,000)	(10,000,000)
Borrowings under term loan	0	25,000,000	0
Repayments of term loan	(3,125,000)	(86,063,000)	(8,400,000)
Payments for debt issuance costs	(433,000)	(2,337,000)	0
Payments on capital lease obligations	(591,000)	(374,000)	(64,000)
Payment of contingent consideration	(314,000)	0	0
Exercise of stock options	1,662,000	5,392,000	1,247,000
Excess tax benefits from stock-based compensation	0	5,313,000	1,131,000
Cash used to net share settle equity awards	(1,058,000)	(913,000)	(806,000)
Repurchase of common stock, including fees	(1,990,000)	0	0
Proceeds from issuance of common stock	0	0	71,760,000
Stock issuance costs	0	0	(4,787,000)
Net cash (used in) provided by financing activities	(1,849,000)	(46,982,000)	50,081,000
Effect of exchange rate changes on cash and cash equivalents	(67,000)	(103,000)	(125,000)
Net (decrease) increase in cash and cash equivalents	(12,868,000)	(39,333,000)	36,631,000
Cash and cash equivalents - Beginning of period	21,897,000	61,230,000	24,599,000
Cash and cash equivalents - End of period	9,029,000	21,897,000	61,230,000
Cash paid during the period for:
Interest, net	11,674,000	9,812,000	11,369,000
Income taxes, net of refunds	12,378,000	3,762,000	4,918,000
Non-cash investing and financing activities:
Property acquired under capital lease	802,000	2,454,000	274,000
Contingent consideration	$ 0	$ 1,320,000	$ 0