Consolidated Statements of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net loss	$ (10,609,577)	$ (10,270,015)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization of equipment and improvements	267,003	224,692
Amortization of identifiable intangible assets	746,065	724,896
Provision for bad debts	37,585	3,851
Allowance for sales adjustments	27,406	(17,921)
Provision for inventory obsolescence	(74,219)	63,324
Deferred rent	(24,396)	(7,677)
Stock-based compensation	1,556,311	2,042,236
Deferred income taxes	3,306	(4,418)
Changes in operating assets and liabilities:
Accounts receivable	448,814	(360,910)
Inventories	(2,971,412)	(2,018,005)
Prepaid expenses and other current assets	137,711	(356,750)
Other assets		30,129
Accounts payable	1,304,445	1,069,511
Accrued expenses and other current liabilities	(1,576,478)	(2,782,663)
Net cash used in operating activities	(10,727,436)	(11,659,720)
Investing Activities
Purchase of investments	(20,000,000)	(25,000,000)
Proceeds from sale of investments	25,996,000	6,234,000
Purchase of equipment and improvements	(433,135)	(350,538)
Purchase of intangible assets		(1,250,000)
Net cash provided by (used in) investing activities	5,562,865	(20,366,538)
Financing Activities
Proceeds from the sale of common stock, net of costs		80,616,032
Proceeds from exercise of stock options and warrants, net of costs	1,885,630	2,086,078
Payment of withholding taxes related to employee stock-based compensation	(67,409)	(121,618)
Net cash provided by financing activities	1,818,221	82,580,492
Effect of exchange rate changes on cash and cash equivalents	447,230	91,745
Net (decrease) increase in cash and cash equivalents	(2,899,120)	50,645,979
Cash and cash equivalents
Beginning of period	19,396,845	6,501,586
End of period	16,497,725	57,147,565
Supplemental disclosures of cash flow information:
Issuance of a warrant in connection with a licensing agreement		129,750
Cash paid during the year for interest		$ 5,442