Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net loss	$ (6,244,778)	$ (2,538,901)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation of equipment and improvements	238,394	252,762
Amortization of intangible assets	742,037	227,078
Provision (recovery) for bad debts	7,000	(6,000)
Allowance for sales adjustments	(30,612)	(8,098)
Provision for inventory obsolescence	33,931	(6,182)
Deferred rent expense	28,757	(22,289)
Stock based compensation	1,490,091	494,918
Deferred income taxes	32,209	30,372
Changes in operating assets and liabilities:
Accounts receivable	141,533	1,134,629
Inventories	308,122	(1,614,237)
Prepaid expenses and other current assets	109,441	(54,780)
Other assets	(6,072)	(14,683)
Accounts payable	614,551	(221,326)
Accrued expenses and other current liabilities	(1,073,097)	406,071
Net cash used in operating activities	(3,608,493)	(1,940,666)
Investing Activities
Purchase of investments	(2,479,000)	(1,244,000)
Proceeds from sale of investments	1,493,000	1,742,000
Purchase of equipment and improvements	(133,733)	(175,098)
Net cash (used in) provided by investing activities	(1,119,733)	322,902
Financing Activities
Proceeds from exercise of stock options and warrants, net of costs	1,608,106	275,938
Payment of withholding taxes related to employee stock compensation	(76,446)	(68,190)
Net cash provided by financing activities	1,531,660	207,748
Effect of exchange rate changes on cash and cash equivalents	32,958	(19,585)
Net decrease in cash and cash equivalents	(3,163,608)	(1,429,601)
Cash and cash equivalents
Beginning of period	41,616,657	17,110,350
End of period	38,453,049	15,680,749
Supplemental disclosures of cash flow information:
Liability accrued in connection with acquisition of an identifiable intangible asset and recognition of a refundable deposit	200,000
Cash paid during the year for interest		$ 908