CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net loss	$ (4,380,445)	$ (2,449,408)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	698,584	884,101
Share-based payment compensation	890,735	1,393,110
Non-cash professional services expenses	0	55,192
Provision for returns and doubtful accounts	(409,050)	(582,599)
Deferred income tax provision	3,807	3,964
Changes in operating assets and liabilities:
Accounts receivable	4,247,431	5,828,861
Prepaid expenses and other current assets	4,342	(87,904)
Inventory	(425,358)	(424,159)
Other assets	(34,291)	42,916
Accounts payable	394,837	(519,826)
Accrued expenses and other liabilities	(2,505,490)	(4,544,446)
Deferred revenue	(277,929)	789,474
Net cash (used in) provided by operating activities	(1,792,827)	389,276
Cash flows from investing activities:
Sales of marketable securities	3,544,663	5,940,285
Purchases of marketable securities	(2,815,604)	(5,602,622)
Purchases of property and equipment	(580,843)	(186,744)
Capitalized software development costs	0	(387,634)
Security deposits	0	(61,569)
Purchase of intangible assets	(14,511)	(22,124)
Net cash provided by (used in) investing activities	133,705	(320,408)
Cash flows from financing activities:
Proceeds from exercise of stock options	697,500	202,865
Net cash provided by financing activities	697,500	202,865
Effect of exchange rate changes on cash and cash equivalents	(81,282)	(154,160)
Net (decrease) increase in cash and cash equivalents	(1,042,904)	117,573
Cash and cash equivalents, beginning of period	18,651,468	16,257,694
Cash and cash equivalents, end of period	17,608,564	16,375,267
Cash paid for income taxes	$ 141,148	$ 499,967