Basis of Presentation - Impact on Financial Results from Adopting Revenue Recognition Standard (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Product revenue	$ 983,645	$ 2,499,655	$ 2,917,589	$ 4,420,707
Support and services revenue	3,027,936	4,234,671	6,087,941	8,352,734
Selling and marketing	872,109	2,109,599	2,065,659	4,160,141
Provision for income taxes	551	94,300	62,990	217,248
Net loss	(1,004,104)	(639,801)	(497,227)	(1,751,998)
Net income attributable to common stockholders	$ (1,296,712)	$ (854,890)	$ (3,340,149)	$ (2,171,662)
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.02)	$ (0.02)	$ (0.05)	$ (0.05)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.02)	$ (0.02)	$ (0.05)	$ (0.05)
Under Previous Guidance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Product revenue	$ 2,407,652		$ 4,075,136
Support and services revenue	2,840,818		6,087,941
Selling and marketing	850,951		2,009,672
Provision for income taxes	551		62,990
Net loss	211,627		604,333
Net income attributable to common stockholders	$ (80,981)		$ (2,238,589)
Basic net loss per share attributable to common stockholders (in dollars per share)	$ 0.00		$ (0.03)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ 0.00		$ (0.03)
Accounting Standards Update 2014-09 | New Revenue Standard Adjustment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Product revenue	$ (1,424,007)		$ (1,157,547)
Support and services revenue	187,118		0
Selling and marketing	21,158		55,987
Provision for income taxes	0		0
Net loss	(1,215,731)		(1,101,560)
Net income attributable to common stockholders	$ (1,215,731)		$ (1,101,560)
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.02)		$ (0.02)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.02)		$ (0.02)