CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (14,871,661)	$ (6,415,705)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	288,188	178,030
Stock-based compensation expense	1,534,100	1,464,225
Changes in operating assets and liabilities:
Accounts receivable	(1,176,745)	484,020
Inventories	(804,009)	(2,736)
Prepaid expenses and other current assets	(349,833)	(663,796)
Deferred costs	440,051	423,856
Other assets	(11,844)	(27,322)
Accounts payable	1,387,543	321,607
Accrued expenses and other current liabilities	1,946,548	404,423
Deferred revenue	(1,676,365)	(4,143,463)
Net cash used in operating activities	(13,294,027)	(7,976,861)
Cash flows from investing activities:
Purchases of equipment, molds, furniture and fixtures	(2,184,568)	(2,425,454)
Additions to patent rights	(195,558)	(283,871)
Proceeds from maturities of investment securities	15,000,000	9,000,000
Purchases of investment securities	(9,118,161)	(15,077,176)
Net cash provided by (used in) investing activities	3,501,713	(8,786,501)
Cash flows from financing activities:
Proceeds from exercise of stock options and warrants	756,611	9,601,723
Taxes paid related to net share settlement of equity awards	(104,329)	(28,916)
Net cash provided by financing activities	652,282	9,572,807
Effect of exchange rate changes on cash and cash equivalents	3,454	(7,475)
Net decrease in cash and cash equivalents	(9,136,578)	(7,198,030)
Cash and cash equivalents:
Beginning of period	52,097,064	19,357,932
End of period	42,960,486	12,159,902
Noncash investing activities:
Purchases of equipment, molds, furniture and fixtures recorded in accounts payable and accrued expenses	$ 437,504	$ 358,828