Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Product revenue	$ 8,972,112	$ 10,116,897
Support and services revenue	16,188,451	20,146,449
Total revenue	25,160,563	30,263,346
Cost of revenue:
Product	785,535	932,446
Support and service	4,755,464	7,351,857
Total cost of revenue	5,540,999	8,284,303
Gross profit	19,619,564	21,979,043
Operating expenses:
Research and development costs	6,517,050	11,702,956
Selling and marketing	6,120,655	13,918,493
General and administrative	6,119,513	6,470,579
Restructuring costs (benefit)	(159,597)	177,389
Total operating expenses	18,597,621	32,269,417
Operating income (loss)	1,021,943	(10,290,374)
Interest and other income (loss), net	38,064	(121,213)
Income (loss) before income taxes	1,060,007	(10,411,587)
Provision for income taxes	7,606	587,207
Net loss	1,052,401	(10,998,794)
Less: Accrual of Series A redeemable convertible preferred stock dividends	873,043	777,890
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	0	1,181,446
Net income (loss) attributable to common stockholders	$ 179,358	$ (12,958,130)
Earnings per share
Basic net loss per share attributable to common stockholders (in dollars per share)	$ 0.00	$ (0.30)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ 0.00	$ (0.30)
Weighted average basic shares outstanding (in shares)	44,413,061	43,091,878
Weighted average diluted shares outstanding (in shares)	46,999,327	43,091,878