Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (11,895)	$ (5,900)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property and equipment	469	322
Amortization of patent and trademark rights	29	161
Redeemable warrants valuation adjustment	1,732	(1,558)
Equity-based compensation	195	348
Other than temporary impairment of marketable securities		258
Inventory Reserve	778
Change in assets and liabilities:
Inventories	(680)	(302)
Prepaid expenses and other current assets	274	(93)
Accounts payable	925	319
Accrued expenses	(8)	(629)
Net cash used in operating activities	(8,181)	(7,074)
Cash flows from investing activities:
Purchase of property, equipment and construction in progress	(4,821)	(849)
Additions to patent and trademark rights	(113)	(92)
Deposits on capital leases refunded (paid)	6	(4)
Maturities of short-term and long-term marketable securities	13,380	11,148
Purchase of short-term and long-term marketable securities	(13,515)	(3,133)
Net cash (used in) provided by investing activities	(5,063)	7,070
Cash flows from financing activities:
Payments on capital leases	(35)	(50)
Proceeds from margin account loan	4,066	1,156
Proceeds from sale of stock, net of issuance costs	9,268
Net cash provided by financing activities	13,299	1,106
Net increase in cash and cash equivalents	55	1,102
Cash and cash equivalents at beginning of period	3,103	2,920
Cash and cash equivalents at end of period	3,158	4,022
Supplemental disclosures of non-cash investing and financing cash flow information:
Issuance of common stock for accounts payable and accrued expenses	262	71
Equipment acquired by capital lease		62
Unrealized gain (loss) on marketable securities	890	107
Redeemable warrants valuation adjustment	1,732	(1,558)
Supplemental disclosure of cash flow information:
Cash paid for interest expense and capitalized construction interest	$ (68)	$ (21)