Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net loss	$ (3,910)	$ (7,252)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	755	1,561
Amortization	482	704
Stock-based compensation	868	738
Loss on sale of property and equipment	0	18
Changes in inventory reserves	443	12
Provision for bad debts	67	227
Other	112	38
Changes in operating assets and liabilities:
Accounts receivable, current and long-term	(1,320)	2,383
Inventories	(426)	(1,627)
Deferred contract costs	(356)	(60)
Prepaid expenses and other assets	3,813	1,262
Accounts payable	667	(2,309)
Accrued expenses and other	(880)	(877)
Deferred revenue, current and long-term	319	(138)
Net cash provided by (used in) operating activities	634	(5,320)
Investing activities
Purchase of property and equipment	(226)	(179)
Additions to patents and licenses	(213)	(11)
Proceeds from sales of property, plant and equipment	2,600	0
Net cash provided by (used in) investing activities	2,161	(190)
Financing activities
Payment of long-term debt and capital leases	(743)	(1,000)
Proceeds from revolving credit facility	41,211	27,088
Payment of revolving credit facility	(40,071)	(27,125)
Payment of common stock issuance costs	0	(1)
Payments to settle employee tax withholdings on stock-based compensation	(4)	(20)
Net proceeds from employee equity exercises	4	12
Net cash provided by (used in) financing activities	397	(1,046)
Net increase (decrease) in cash and cash equivalents	3,192	(6,556)
Cash and cash equivalents at beginning of period	15,542	20,002
Cash and cash equivalents at end of period	$ 18,734	$ 13,446