CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (11,807,401)		$ (12,638,045)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	2,056,664		2,445,434
Share-based payment compensation	1,258,000		3,566,265
Non-cash professional services expenses	36,942		27,891
Realized gain on marketable securities	(3,545)		(546)
Provision for returns and doubtful accounts	(391,371)		205,437
Deferred income tax provision	(11,737)		11,892
Changes in operating assets and liabilities:
Accounts receivable	5,851,286		8,169,755
Prepaid expenses and other current assets	663,592		(2,809,510)
Inventory	(109,621)		1,047,180
Other assets	(32,900)		81,066
Accounts payable	(1,075,552)		(1,372,792)
Accrued expenses and other long-term liabilities	(5,267,189)		(4,762,389)
Deferred revenue	1,339,297		(3,523,142)
Net cash used in operating activities	(7,493,535)		(9,551,504)
Cash flows from investing activities:
Sales of marketable securities	20,806,642		26,158,050
Purchases of marketable securities	(16,044,295)		(18,255,770)
Purchases of property and equipment	(1,124,170)		(2,147,191)
Capitalized software development costs	(830,301)		(461,555)
Security deposits	(250,000)		(39,622)
Purchase of intangible assets	(100,556)		(86,958)
Net cash provided by investing activities	2,457,320		5,166,954
Cash flows from financing activities:
Proceeds from exercise of stock options	697,500		624,155
Proceeds from issuance of Series A preferred stock, net of issuance costs	8,731,677		0
Net cash provided by financing activities	9,429,177		624,155
Effect of exchange rate changes on cash and cash equivalents	(93,787)		(342,890)
Net (decrease) increase in cash and cash equivalents	4,299,175		(4,103,285)
Cash and cash equivalents, beginning of period	18,651,468		16,257,694
Cash and cash equivalents, end of period	22,950,643		12,154,409
Supplemental disclosures:
Cash paid/(refund received) for income taxes, net	59,023	[1]	568,646
Non-cash financing activities:
Undistributed preferred stock dividends	$ 28,875		$ 0

[1] The Company did not pay any interest for the nine months ended September 30, 2013 and 2012.