Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows From Operating Activities:
Net loss	$ (8,576,379)	$ (6,583,102)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of property, plant and equipment, and investment in leased property	544,798	486,275
Amortization of intangible assets	573,730	575,773
Stock-based compensation	505,685	524,055
Loss on disposal of property, plant and equipment		57,680
Change in fair value of common stock warrant liability	2,131,314	(1,238,750)
Changes in operating assets and liabilities that provide (use) cash:
Accounts receivable	(1,555,264)	419,638
Inventory	(1,540,017)	2,245,528
Prepaid expenses and other current assets	91,624	717,034
Note receivable	15,024
Accounts payable, accrued expenses, product warranty reserve and other liabilities	642,949	(2,121,367)
Deferred revenue	1,233,120	1,441,497
Net cash used in operating activities	(5,933,416)	(3,475,739)
Cash Flows From Investing Activities:
Purchase of property, plant and equipment	(1,909)
Proceeds from disposal of property, plant and equipment		57,900
Net cash (used in) provided by investing activities	(1,909)	57,900
Cash Flows From Financing Activities:
Restricted cash	(750,000)
Proceeds from exercise of warrants	435,000
Proceeds from issuance of common stock and warrants	3,257,117	17,685,403
Stock issuance costs	(943,557)	(1,891,378)
Repayment of borrowings under line of credit	(3,380,835)	(5,405,110)
Proceeds from finance obligation	2,600,000
Principal payments on obligations under capital lease and finance obligation	(158,049)
Net cash provided by financing activities	1,059,676	10,388,915
Effect of exchange rate changes on cash	(1,572)	1,064
Increase (decrease) in cash and cash equivalents	(4,877,221)	6,972,140
Cash and cash equivalents, beginning of period	9,380,059	13,856,893
Cash and cash equivalents, end of period	$ 4,502,838	$ 20,829,033