Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ (11,016)	$ (11,843)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	832	747
Stock-based compensation expense	2,018	1,678
Recovery of losses on accounts receivable	(1)	(209)
Debt cost expense	372	141
Loss on disposal of fixed assets	48
Changes in assets and liabilities:
Accounts receivable	(539)	(236)
Inventories	1,773	(2,599)
Prepaid expenses and other current assets	135	556
Other assets	(9)
Accounts payable	(334)	54
Accrued expenses	162	(202)
Accrued compensation	(49)	(401)
Advances from customers	(5,021)	5,693
Net cash used in operating activities	(11,629)	(6,621)
Cash flows from investing activities:
Purchase of short-term investments		(149)
Proceeds from short-term investment sales/maturities		596
Proceeds from disposal of fixed assets	10
Purchases of property and equipment	(209)	(269)
Net cash (used in) provided by investing activities	(199)	178
Cash flows from financing activities:
Advances on line of credit—related party	5,000	2,500
Payments for deferred debt cost	(5)
Payments on capital leases	(87)	(64)
Proceeds from private placement		10,500
Proceeds from exercise of stock options	428	147
Common stock repurchased	(14)
Net cash provided by financing activities	5,322	13,083
Net (decrease) increase in cash and cash equivalents	(6,506)	6,640
Cash and cash equivalents at April 1	9,180	2,540
Cash and cash equivalents at March 31	2,674	9,180
Cash paid during the fiscal year for:
Interest	425	250
Income taxes	4	27
Non-cash investing and financing activities:
Net transfers of inventory (from) to fixed assets for use as demonstration equipment	(353)	678
Capital leases entered into for equipment purchases	135	86
Issuance of stock warrants with line of credit—related party	$ 1,611	$ 117