Condensed Consolidated Statements of Cash Flows (In thousands) (Unaudited) (USD $) In Thousands	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ (2,630)	$ (2,469)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	189	189
Stock-based compensation expense	474	392
Issuance of restricted stock awards	2	7
Provision for (recovery of) bad debt expenses	17	(178)
Debt cost expense	41	27
Loss on disposal of fixed asset	1
Changes in assets and liabilities:
Accounts receivable	405	(455)
Inventories	(777)	38
Prepaid expenses and other current assets	(94)	577
Accounts payable	(73)	(35)
Accrued expenses	(158)	(189)
Accrued compensation	166	(60)
Advances from customers	(1,661)
Net cash used in operating activities	(4,098)	(2,156)
Cash flows from investing activities:
Purchase of short-term investments		(149)
Proceeds from short-term investment sales/maturities		99
Purchase of property and equipment	(76)	(10)
Net cash used in investing activities	(76)	(60)
Cash flows from financing activities:
Advance on line of credit—related party		2,000
Payments of capital leases	(18)	(19)
Proceeds from exercise of stock options	207
Common stock repurchased	(4)
Net cash provided by financing activities	185	1,981
Net decrease in cash and cash equivalents	(3,989)	(235)
Cash and cash equivalents at beginning of period	9,180	2,540
Cash and cash equivalents at end of period	5,191	2,305
Cash paid during the period for:
Interest	98	4
Income taxes	3	21
Non-cash financing activities:
Net transfers of inventory to fixed assets for use as demonstration equipment	110	222
Capital lease entered into for equipment purchase	135
Issuance of stock warrants with line of credit—related party		$ 87