Income Taxes - Summary of Significant Components of Deferred Tax Assets (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Components Of Deferred Tax Assets [Abstract]
Acquired technology	$ 201,000	$ 276,000
Stock compensation expense	539,000	430,000
Accruals and other	130,000	124,000
Total deferred tax assets	870,000	830,000
Less valuation allowance	$ (870,000)	$ (830,000)