Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net loss	$ (2,449,408)	$ (5,966,265)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	884,101	1,128,717
Share-based payment compensation	1,393,110	1,225,452
Non-cash professional services expenses	55,192	89,495
Provision for returns and doubtful accounts	(582,599)	(734,969)
Deferred income tax provision	3,964	14,912
Changes in operating assets and liabilities:
Accounts receivable	5,828,861	8,361,870
Prepaid expenses and other current assets	(87,904)	(521,192)
Inventory	(424,159)	(57,166)
Other assets	42,916	25,944
Accounts payable	(519,826)	222,353
Accrued expenses and other liabilities	(4,544,446)	(105,139)
Deferred revenue	789,474	1,941,385
Net cash provided by (used in) operating activities	389,276	5,625,397
Cash flows from investing activities:
Sales of marketable securities	5,940,285	5,204,117
Purchases of marketable securities	(5,602,622)	(7,064,050)
Purchases of property and equipment	(186,744)	(797,442)
Capitalized software development costs	(387,634)	(121,622)
Security deposits	(61,569)	(8,522)
Purchase of intangible assets	(22,124)	(29,700)
Net cash used in investing activities	(320,408)	(2,817,219)
Cash flows from financing activities:
Proceeds from exercise of stock options	202,865	467,354
Net cash provided by financing activities	202,865	467,354
Effect of exchange rate changes on cash and cash equivalents	(154,160)	(47,766)
Net (decrease) increase in cash and cash equivalents	117,573	3,227,766
Cash and cash equivalents, beginning of period	16,257,694	17,842,555
Cash and cash equivalents, end of period	16,375,267	21,070,321
Cash paid for income taxes	$ 499,967	$ 94,122