CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net loss	$ (11,855,303)	$ (8,905,563)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	2,224,070	2,980,215
Share-based payment compensation	2,529,229	4,397,103
Non-cash professional services expenses	126,071	575,567
Realized loss on marketable securities		120
Tax benefit from stock option exercises		(412,815)
Provision for returns and doubtful accounts	(317,809)	1,332,905
Deferred income tax provision	14,912	23,585
Changes in operating assets and liabilities:
Accounts receivable	6,060,390	7,072,901
Prepaid expenses and other current assets	(263,610)	(43,847)
Income tax receivable		(5,512,694)
Inventory	190,831	(1,152,838)
Other assets	11,854	220,292
Accounts payable	936,232	(390,630)
Accrued expenses and other liabilities	431,453	(779,709)
Deferred revenue	2,248,781	(386,101)
Net cash provided by (used in) operating activities	2,337,101	(981,509)
Cash flows from investing activities:
Sales of marketable securities	10,284,132	9,113,411
Purchases of marketable securities	(12,231,093)	(10,555,448)
Purchases of property and equipment	(1,289,194)	(1,744,897)
Capitalized software development costs	(700,084)
Security deposits	(8,522)	1,981
Purchase of intangible assets	(35,220)	(75,193)
Net cash used in investing activities	(3,979,981)	(3,260,146)
Cash flows from financing activities:
Proceeds from exercise of stock options	552,774	249,343
Tax benefits from stock option exercises		412,815
Net cash provided by financing activities	552,774	662,158
Effect of exchange rate changes on cash and cash equivalents	(135,803)	(263,734)
Net decrease in cash and cash equivalents	(1,225,909)	(3,843,231)
Cash and cash equivalents, beginning of period	17,842,555	15,752,528
Cash and cash equivalents, end of period	16,616,646	11,909,297
Cash paid for income taxes	$ 278,871	$ 27,500