Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue:
Product revenue	$ 24,847,724	$ 17,723,000	$ 27,338,557
Support and services revenue	23,723,267	28,550,515	31,297,947
Total revenue	48,570,991	46,273,515	58,636,504
Cost of revenue:
Product	1,942,985	2,791,950	4,155,413
Support and service	7,739,149	7,838,766	11,000,401
Total cost of revenue	9,682,134	10,630,716	15,155,814
Gross profit	38,888,857	35,642,799	43,480,690
Operating expenses:
Research and development costs	12,787,606	12,452,528	15,613,543
Selling and marketing	18,021,989	24,426,438	25,222,954
General and administrative	9,181,289	9,105,545	12,265,038
Investigation, litigation, and settlement related costs (benefits)	8,842	(5,417,925)	373,619
Restructuring costs	172,995	1,135,310	3,606,020
Total operating expenses	40,172,721	41,701,896	57,081,174
Operating loss	(1,283,864)	(6,059,097)	(13,600,484)
Interest and other (loss) income, net	(269,954)	(642,633)	1,094,126
Loss before income taxes	(1,553,818)	(6,701,730)	(12,506,358)
Provision (benefit) for income taxes	375,543	510,091	(1,573,768)
Net loss	(1,929,361)	(7,211,821)	(10,932,590)
Less: Accrual of Series A redeemable convertible preferred stock dividends	765,203	747,616	216,379
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	587,613	493,363	127,504
Net loss attributable to common stockholders	$ (3,282,177)	$ (8,452,800)	$ (11,276,473)
Earnings per share
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.08)	$ (0.18)	$ (0.24)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.08)	$ (0.18)	$ (0.24)
Weighted average basic shares outstanding (in shares)	41,093,644	46,265,225	47,979,467
Weighted average diluted shares outstanding (in shares)	41,093,644	46,265,225	47,979,467