CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net loss	$ (17,253,479)	$ (35,322,390)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	3,195,073	4,354,931
Share-based payment compensation	4,059,643	6,393,806
Non-cash professional services expenses	32,235	776,811
Realized loss (gain) on marketable securities		(7,319)
Deferred tax asset valuation allowance		16,278,521
Provision for returns and doubtful accounts	223,751	2,281,695
Deferred income tax provision	14,912	(2,348,722)
Changes in operating assets and liabilities:
Accounts receivable	9,697,385	3,479,636
Prepaid expenses and other current assets	(45,891)	(23,459)
Income tax receivable	(195,009)	315,734
Inventory	(4,294)	(1,720,315)
Other assets	55,014	156,791
Accounts payable	272,517	(374,066)
Accrued expenses and other liabilities	227,184	1,609,415
Deferred revenue	1,405,560	(1,737,518)
Net cash provided by (used in) operating activities	1,684,601	(5,886,449)
Cash flows from investing activities:
Sales of marketable securities	17,558,993	18,956,114
Purchases of marketable securities	(18,899,974)	(18,052,117)
Purchases of property and equipment	(1,527,048)	(2,024,786)
Capitalized software development costs	(849,922)
Security deposits	(8,522)	9,081
Purchase of intangible assets	(107,970)	(81,688)
Net cash used in investing activities	(3,834,443)	(1,193,396)
Cash flows from financing activities:
Proceeds from exercise of stock options	860,714	378,559
Net cash provided by financing activities	860,714	378,559
Effect of exchange rate changes on cash and cash equivalents	(191,823)	(243,210)
Net decrease in cash and cash equivalents	(1,480,951)	(6,944,496)
Cash and cash equivalents, beginning of period	17,842,555	15,752,528
Cash and cash equivalents, end of period	16,361,604	8,808,032
Cash paid for income taxes	$ 449,583	$ 79,441