CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (12,638,045)	$ (17,253,479)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	2,445,434	3,195,073
Share-based payment compensation	3,566,265	4,059,643
Non-cash professional services expenses	27,891	32,235
Realized gain on marketable securities	(546)	0
Provision for returns and doubtful accounts	205,437	223,751
Deferred income tax provision	11,892	14,912
Changes in operating assets and liabilities:
Accounts receivable	8,169,755	9,697,385
Prepaid expenses and other current assets	(2,809,510)	(240,900)
Inventory	1,047,180	(4,294)
Other assets	81,066	55,014
Accounts payable	(1,372,792)	272,517
Accrued expenses and other liabilities	(4,762,389)	227,184
Deferred revenue	(3,523,142)	1,405,560
Net cash (used in) provided by operating activities	(9,551,504)	1,684,601
Cash flows from investing activities:
Sales of marketable securities	26,158,050	17,558,993
Purchases of marketable securities	(18,255,770)	(18,899,974)
Purchases of property and equipment	(2,147,191)	(1,527,048)
Capitalized software development costs	(461,555)	(849,922)
Security deposits	(39,622)	(8,522)
Purchase of intangible assets	(86,958)	(107,970)
Net cash provided by (used in) investing activities	5,166,954	(3,834,443)
Cash flows from financing activities:
Proceeds from exercise of stock options	624,155	860,714
Net cash provided by financing activities	624,155	860,714
Effect of exchange rate changes on cash and cash equivalents	(342,890)	(191,823)
Net decrease in cash and cash equivalents	(4,103,285)	(1,480,951)
Cash and cash equivalents, beginning of period	16,257,694	17,842,555
Cash and cash equivalents, end of period	12,154,409	16,361,604
Cash paid for income taxes	$ 568,646	$ 449,583