Consolidated Statements of Cash Flows	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash flows from operating activities:
Net loss	$ (1,929,361)	$ (7,211,821)	$ (10,932,590)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	1,988,924	2,503,762	2,660,826
Share-based payment compensation	1,351,303	1,465,010	1,668,050
Non-cash professional services expenses	578,074	1,173	37,379
Gain on Estate litigation settlement	0	(5,293,319)	0
Restructuring costs	172,995	921,895	3,580,731
Payment of restructuring costs	(469,248)	(1,199,473)	(2,274,716)
Realized gain on marketable securities	0	0	(826)
Gain on sale of cost method investment	0	0	(2,096,364)
Loss on disposal of fixed assets	45,578	0	0
Provision for returns and doubtful accounts	(6,745)	(64,904)	(294,074)
Deferred income tax provision	(126,640)	121,694	110,203
Changes in operating assets and liabilities:
Accounts receivable	2,232,538	2,394,162	3,327,614
Prepaid expenses and other current assets	(202,147)	(11,072)	1,129,742
Inventory	281,959	566,897	(276,571)
Other assets	15,978	168,042	(95,052)
Accounts payable	(231,598)	280,170	(1,809,000)
Accrued expenses and other long-term liabilities	674,603	(1,142,903)	(11,758,230)
Deferred revenue	(10,699,696)	6,991,933	5,887,953
Net cash (used in) provided by operating activities	(6,323,483)	491,246	(11,134,925)
Cash flows from investing activities:
Sales of marketable securities	15,200,100	39,131,215	33,982,164
Purchases of marketable securities	(11,863,108)	(41,958,829)	(31,527,129)
Proceeds from sale of cost method investment	0	0	3,000,000
Transfer from restricted cash	0	750,000	0
Purchases of property and equipment	(796,654)	(758,906)	(1,536,167)
Proceeds from sale of fixed assets	3,153	0	0
Capitalized software development costs	(134,100)	(184,215)	(973,842)
Security deposits	229,016	(16,723)	(244,814)
Purchase of intangible assets	(214,500)	(138,315)	(128,122)
Net cash provided by (used in) investing activities	2,423,907	(3,175,773)	2,572,090
Cash flows from financing activities:
Proceeds from exercise of stock options	59,242	24,684	697,500
Repurchase of common stock	(137,858)	(4,685,401)	0
Dividends paid on Series A redeemable convertible preferred stock	(377,690)	(777,091)	0
Proceeds from issuance of Series A redeemable convertible preferred stock, net of issuance costs	0	0	8,731,677
Net cash (used in) provided by financing activities	(456,306)	(5,437,808)	9,429,177
Effect of exchange rate changes on cash and cash equivalents	(504,627)	(292,114)	(229,470)
Net (decrease) increase in cash and cash equivalents	(4,860,509)	(8,414,449)	636,872
Cash and cash equivalents, beginning of period	10,873,891	19,288,340	18,651,468
Cash and cash equivalents, end of period	6,013,382	10,873,891	19,288,340
Supplemental Disclosures:
Cash paid for income taxes, net	195,895	186,194	95,593
Non-cash financing activities:
Undistributed Series A redeemable convertible preferred stock dividends	188,805	186,904	216,379
Shares issued for Series A redeemable convertible preferred stock dividend payment	$ 385,612	$ 0	$ 0