Stock-based Compensation - Additional Information (Detail) - USD ($)					1 Months Ended	3 Months Ended								9 Months Ended
	Jun. 22, 2017	May 04, 2017	Feb. 09, 2017	Feb. 15, 2016	Jun. 30, 2016	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards							0				0			1,056,000	700,000
Weighted-average grant date fair value							$ 0.00				$ 0.00			$ 0.37	$ 0.72
Stock options vested														386,666
Stock options forfeited														71,200
Number of stock options, exercised														0
Non-employee Directors [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Annual retainer amount for the threshold of stock precluded from selling														$ 270,000
2012 Equity Incentive Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of additional shares available for issuance under stock option plan		1,500,000
2012 Equity Incentive Plan [Member] | Non-employee Directors [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	140,000			80,000
Exercise price	$ 0.37			$ 0.84
2012 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares awarded to each non-employee director			40,000	40,000
Restricted shares vest in each quarter end							10,000	10,000	10,000	10,000	10,000	10,000	10,000	30,000
Restricted shares ending date														Under the Company's 2012 Equity Incentive Plan of which, 10,000 restricted shares vest at the end of each calendar quarter in 2017, provided the recipient remains a director through the vesting date.
2012 Equity Incentive Plan [Member] | Former Director [Member] | Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares vest in each quarter end					20,000
2012 Equity Incentive Plan [Member] | Management [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	455,000
Exercise price	$ 0.37
2012 Equity Incentive Plan [Member] | Staff [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	41,000
Exercise price	$ 0.37
2012 Equity Incentive Plan [Member] | Scenario, Forecast [Member] | Non-employee Directors [Member] | Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares vest in each quarter end						10,000