Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (10,557)	$ (11,016)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,469	2,018
Depreciation and amortization	795	832
Provision for (recovery of) bad debt expenses	5	(1)
Debt cost expense	272	372
Loss on extinguishment of debt	1,244
Loss on disposal of fixed assets	58	48
Changes in assets and liabilities:
Accounts receivable	(1,497)	(539)
Inventories	(1,372)	1,773
Prepaid expenses and other current assets	(79)	135
Other assets		(9)
Accounts payable	713	(334)
Accrued expenses	(216)	162
Accrued compensation	(1)	(49)
Deferred revenue	(86)
Advances from customers	(394)	(5,021)
Net cash used in operating activities	(9,646)	(11,629)
Cash flows from investing activities:
Purchases of property and equipment	(95)	(209)
Proceeds from disposal of fixed assets	5	10
Net cash used in investing activities	(90)	(199)
Cash flows from financing activities:
Net proceeds from sale of common stock	878
Proceeds from exercise of stock options	99	428
Common stock repurchased	(36)	(14)
Payments of capital leases	(91)	(87)
Net cash provided by financing activities	7,850	5,322
Net decrease in cash and cash equivalents	(1,886)	(6,506)
Cash and cash equivalents at beginning of period	2,674	9,180
Cash and cash equivalents at end of period	788	2,674
Cash paid during the period for:
Interest	592	425
Income taxes	17	4
Non-cash financing activities:
Debt consolidation	15,000
Net transfers of inventory to fixed assets for use as demonstration equipment	184	353
Capital lease entered into for equipment purchase		135
Issuance of stock warrants with line of credit—related party		1,611
Related Party [Member]
Cash flows from financing activities:
Proceeds from issuance of convertible debt—related party	2,000
Proceeds from promissory note—related party	5,000
Advance on line of credit—related party		5,000
Payment of costs related to line of credit—related party		$ (5)