Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities
Net loss	$ (2,940)	$ (3,652)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	389	786
Amortization	243	351
Stock-based compensation	329	385
Loss on sale of property and equipment	0	4
Changes in inventory reserves	254	83
Changes in bad debt reserves	(375)	219
Other	56	19
Changes in operating assets and liabilities:
Accounts receivable, current and long-term	(1,805)	(758)
Inventories	1,280	(1,503)
Deferred contract costs	(200)	(81)
Prepaid expenses and other assets	2,203	977
Accounts payable	(1,516)	2,009
Accrued expenses and other	(285)	(981)
Deferred revenue, current and long-term	52	2
Net cash used in operating activities	(2,315)	(2,140)
Investing activities
Purchase of property and equipment	(53)	(104)
Proceeds from sales of property, plant and equipment	2,600	0
Net cash provided by (used in) investing activities	2,547	(104)
Financing activities
Payment of long-term debt and capital leases	(381)	(521)
Proceeds from revolving credit facility	16,658	5,373
Payment of revolving credit facility	(17,889)	(4,685)
Payment of common stock issuance costs	0	(1)
Payments to settle employee tax withholdings on stock-based compensation	(4)	0
Net proceeds from employee equity exercises	2	12
Net cash (used in) provided by financing activities	(1,614)	178
Net decrease in cash and cash equivalents	(1,382)	(2,066)
Cash and cash equivalents at beginning of period	15,542	20,002
Cash and cash equivalents at end of period	$ 14,160	$ 17,936