Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities:
Net loss	$ (9,734)	$ (8,936)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	519	754
Share-based compensation	(3)	363
Loss on disposal of assets		16
Change in fair value of warrants	(179)	(1,022)
Changes in operating assets and liabilities:
Accounts receivable, net	(243)	409
Product inventories	(2,478)	810
Prepaid expenses and other current assets	218	(19)
Trade accounts payable	355	(1,000)
Accrued salaries and benefits	(204)	542
Accrued warranty	29	28
Deferred revenues	945	(865)
Accrued liabilities	17	80
Net cash used in operating activities	(10,758)	(8,840)
Cash flows from investing activities:
Increase in restricted cash	(293)
Purchase of property, plant and equipment	(56)	(300)
Proceeds from disposition of assets		5
Net cash used in investing activities	(349)	(295)
Cash flows from financing activities:
Issuance of common shares for cash, net of issuance costs		5,723
Proceeds from notes payable		1,500
Payment of notes payable		(197)
Repayment of capital lease obligation	(5)	(9)
Net cash (used in) provided by financing activities	(5)	7,017
Effect of exchange rate changes on cash and cash equivalents	(132)
Net decrease in cash and cash equivalents	(11,244)	(2,118)
Cash and cash equivalents, beginning of period	46,519	4,695
Cash and cash equivalents, end of period	35,275	2,577
Supplemental disclosures:
Cash paid for interest	1	32
Cash paid for income taxes	0	0
Non-cash transactions:
Acquisition of assets included in accounts payable		$ 16