Basis of Presentation - Impact on Financial Results from Adopting Revenue Recognition Standard (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Product revenue	$ 1,933,944	$ 1,921,052
Support and services revenue	3,060,005	4,118,063
Selling and marketing	1,193,550	2,050,542
Provision for income taxes	62,439	122,948
Net income (loss)	506,877	(1,112,197)
Net income attributable to common stockholders	$ (2,043,437)	$ (1,316,772)
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.05)	$ (0.03)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.05)	$ (0.03)
Under Previous Guidance
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Product revenue	$ 1,667,484
Support and services revenue	3,247,123
Selling and marketing	1,158,721
Provision for income taxes	62,439
Net income (loss)	392,706
Net income attributable to common stockholders	$ (2,157,608)
Basic net loss per share attributable to common stockholders (in dollars per share)	$ (0.05)
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.05)
Accounting Standards Update 2014-09 | New Revenue Standard Adjustment
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Product revenue	$ 266,460
Support and services revenue	(187,118)
Selling and marketing	34,829
Provision for income taxes	0
Net income (loss)	114,171
Net income attributable to common stockholders	$ 114,171
Basic net loss per share attributable to common stockholders (in dollars per share)	$ 0.00
Diluted net loss per share attributable to common stockholders (in dollars per share)	$ 0.00