Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net loss	$ (20,126)	$ (32,061)	$ (6,199)
Adjustments to reconcile net loss to net cash provided by (used in)
Depreciation	2,950	2,853	3,798
Amortization	1,215	1,327	704
Stock-based compensation expense	1,462	1,499	1,593
Accretion of fair value on contingent consideration	0	0	11
Deferred income tax (benefit) expense	0	0	(2,123)
Impairment on assets	6,023	12,130	0
Loss (gain) on sale of property and equipment	40	(21)	1,733
Provision for inventory reserves	509	361	1,995
Provision for bad debts	575	285	174
Other	258	265	165
Changes in operating assets and liabilities, net of changes from acquisitions:
Accounts receivable, current and long-term	7,116	(1,909)	8,395
Inventories, current and long-term	(3,249)	(2,356)	3,962
Deferred contract costs	137	651	1,376
Prepaid expenses and other current assets	(2,645)	1,261	(1,072)
Accounts payable	713	2,475	(762)
Accrued expenses and other	1,803	838	(1,575)
Deferred revenue, current and long-term	(254)	(410)	(2,274)
Net cash (used in) provided by operating activities	(3,473)	(12,812)	9,901
Investing activities
Cash paid for acquisition, net of cash acquired	0	0	(4,992)
Purchase of property and equipment	(401)	(2,006)	(410)
Purchase of short-term investments	0	(2)	(4)
Sale of short-term investments	0	472	555
Additions to patents and licenses	(6)	(234)	(43)
Proceeds from sales of property, plant and equipment	35	1,040	80
Net cash used in investing activities	(372)	(730)	(4,814)
Financing activities
Payment of long-term debt	(1,901)	(4,494)	(3,229)
Proceeds from revolving credit facility	65,767	2,500	0
Repayments of revolving credit facility	(64,549)	0	0
Proceeds from long-term debt	0	446	0
Proceeds from repayment of shareholder notes	0	46	215
Proceeds from issuance of common stock, net of issuance costs	(2)	17,465	0
Payments to settle employee tax withholdings on stock-based compensation	(34)	(22)	0
Excess tax benefits from stock-based compensation	0	0	13
Deferred financing costs	0	(406)	(19)
Net proceeds from employee equity exercises	104	441	1,125
Net cash (used in) provided by financing activities	(615)	15,976	(1,895)
Net increase (decrease) in cash and cash equivalents	(4,460)	2,434	3,192
Cash and cash equivalents at beginning of period	20,002	17,568	14,376
Cash and cash equivalents at end of period	15,542	20,002	17,568
Supplemental cash flow information:
Cash paid for interest	191	287	423
Cash paid for income taxes	18	42	22
Supplemental disclosure of non-cash investing and financing activities:
Vendor financed capital lease addition	396	0	0
Shares returned to treasury in satisfaction of receivable	0	0	48
Acquisition related contingent consideration liability	0	0	612
Acquisition financed through debt	0	0	3,123
Common stock issued for acquisition	$ 0	$ 0	$ 2,416