CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net loss	$ (9,587,738)	$ (9,069,994)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	1,369,782	1,702,187
Share-based payment compensation	1,131,530	2,508,448
Non-cash professional services expenses	0	29,930
Realized gain on marketable securities	(3,199)	(546)
Provision for returns and doubtful accounts	(378,923)	(325,591)
Deferred income tax provision	(7,772)	7,928
Changes in operating assets and liabilities:
Accounts receivable	4,791,340	9,248,544
Prepaid expenses and other current assets	281,372	43,214
Inventory	(261,379)	668,363
Other assets	(39,742)	(20,718)
Accounts payable	(712,032)	(222,903)
Accrued expenses and other liabilities	(2,168,298)	(6,202,916)
Deferred revenue	(1,237,922)	(837,581)
Net cash used in operating activities	(6,822,981)	(2,471,635)
Cash flows from investing activities:
Sales of marketable securities	7,480,733	11,818,443
Purchases of marketable securities	(4,789,832)	(7,341,816)
Purchases of property and equipment	(1,116,911)	(1,612,104)
Capitalized software development costs	(247,429)	(461,555)
Security deposits	(250,000)	(41,746)
Purchase of intangible assets	(61,781)	(44,610)
Net cash provided by investing activities	1,014,780	2,316,612
Cash flows from financing activities:
Proceeds from exercise of stock options	697,500	624,155
Net cash provided by financing activities	697,500	624,155
Effect of exchange rate changes on cash and cash equivalents	(246,987)	(242,694)
Net (decrease) increase in cash and cash equivalents	(5,357,688)	226,438
Cash and cash equivalents, beginning of period	18,651,468	16,257,694
Cash and cash equivalents, end of period	13,293,780	16,484,132
Cash paid/(refund received) for income taxes, net	$ (132,217)	$ 528,714