Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net loss	$ (10,932,590)	$ (14,984,321)	$ (23,368,283)
Adjustments to reconcile net loss to net cash from operating activities:
Depreciation and amortization	2,660,826	3,314,360	4,107,761
Share-based payment compensation	1,668,050	4,587,282	5,493,689
Non-cash professional services expenses	37,379	27,487	24,369
Restructuring costs	3,606,020	770,749	822,320
Payment of restructuring costs	(2,300,005)	(770,271)	(702,276)
Realized gain on marketable securities	(826)	(905)	0
Impairment of cost method investments	0	10,725	41,780
Gain on sale of cost method investment	(2,096,364)	0	0
Provision for returns and doubtful accounts	(294,074)	357,301	120,992
Deferred income tax provision	110,203	(83,350)	(160,434)
Changes in operating assets and liabilities:
Accounts receivable	3,327,614	4,849,209	3,830,769
Prepaid expenses and other current assets	1,129,742	(889,278)	(333,732)
Inventory	(276,571)	1,126,188	(359,348)
Other assets	(95,052)	31,837	48,135
Accounts payable	(1,809,000)	(101,784)	1,446,111
Accrued expenses and other long-term liabilities	(11,758,230)	(660,906)	8,550,746
Deferred revenue	5,887,953	(2,852,793)	3,576,167
Net cash (used in) provided by operating activities	(11,134,925)	(5,268,470)	3,138,766
Cash flows from investing activities:
Sales of marketable securities	33,982,164	32,332,954	22,098,206
Purchases of marketable securities	(31,527,129)	(21,267,582)	(24,101,138)
Proceeds from sale of cost method investment	3,000,000	0	0
Transfer to restricted cash	0	(750,000)	0
Purchases of property and equipment	(1,536,167)	(2,487,128)	(2,220,380)
Capitalized software development costs	(973,842)	(461,555)	(1,001,025)
Security deposits	(244,814)	(29,746)	(48,238)
Purchase of intangible assets	(128,122)	(101,642)	(127,890)
Net cash provided by (used in) investing activities	2,572,090	7,235,301	(5,400,465)
Cash flows from financing activities:
Proceeds from exercise of stock options	697,500	738,184	920,106
Proceeds from issuance of Series A preferred stock, net of issuance costs	8,731,677	0	0
Net cash provided by financing activities	9,429,177	738,184	920,106
Effect of exchange rate changes on cash and cash equivalents	(229,470)	(311,241)	(243,268)
Net increase (decrease) in cash and cash equivalents	636,872	2,393,774	(1,584,861)
Cash and cash equivalents, beginning of period	18,651,468	16,257,694	17,842,555
Cash and cash equivalents, end of period	19,288,340	18,651,468	16,257,694
Supplemental Disclosures:
Cash paid/(refund received) for income taxes, net	95,593	688,167	1,221,294
Non-cash financing activities:
Less: Accrual of preferred stock dividends	$ 216,379	$ 0	$ 0