Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 6,013,382	$ 10,873,891
Marketable securities	7,420,042	10,900,722
Accounts receivable, net of allowances of $191,285 and $119,530, respectively	6,635,262	8,898,680
Prepaid expenses and other current assets	1,742,668	1,596,916
Inventory	70,534	352,493
Deferred tax assets, net	205,816	316,586
Total current assets	22,087,704	32,939,288
Property and equipment, net of accumulated depreciation of $17,947,675 and $16,867,911, respectively	1,565,932	2,147,188
Deferred tax assets, net	110,060	7,503
Software development costs, net	1,116,816	1,508,517
Other assets	1,139,377	1,373,964
Goodwill	4,150,339	4,150,339
Other intangible assets, net	256,137	196,037
Total assets	30,426,365	42,322,836
Current liabilities:
Accounts payable	1,005,944	1,266,504
Accrued expenses	6,783,514	6,939,198
Deferred tax liabilities, net	89,343	23,307
Deferred revenue, net	16,553,519	23,380,012
Total current liabilities	24,432,320	31,609,021
Liabilities, Noncurrent [Abstract]
Other long-term liabilities	735,089	630,444
Deferred tax liabilities, net	27,069	226,443
Deferred revenue, net	9,122,289	13,097,215
Total liabilities	$ 34,316,767	$ 45,563,123
Commitments and contingencies (Note 12)
Series A redeemable convertible preferred stock, $.001 par value, 2,000,000 shares authorized, 900,000 shares issued and outstanding, redemption value of $9,000,000	$ 7,818,554	$ 7,230,941
Stockholders' equity:
Common stock - $.001 par value, 100,000,000 shares authorized, 57,194,817 and 56,360,222 shares issued, respectively and 41,666,747 and 40,924,313 shares outstanding, respectively	57,195	56,360
Additional paid-in capital	167,953,871	166,933,291
Accumulated deficit	(120,983,891)	(119,054,530)
Common stock held in treasury, at cost (15,528,070 and 15,435,909 shares, respectively)	(57,032,917)	(56,895,059)
Accumulated other comprehensive loss, net	(1,703,214)	(1,511,290)
Total stockholders' deficit	(11,708,956)	(10,471,228)
Total liabilities and stockholders' deficit	$ 30,426,365	$ 42,322,836