Significant Concentrations - Additional Information (Detail) - USD ($)		12 Months Ended
	Mar. 01, 2019	Dec. 31, 2018
Concentration Risk [Line Items]
Distribution partners in Europe, Turkey and Africa existing distribution agreements expiration date		Jun. 30, 2019
Rebate credits outstanding		$ 329,000
Cost of revenue [Member]
Concentration Risk [Line Items]
Allocation of rebate values, percentage		30.00%
Reduction in marketing expense [Member]
Concentration Risk [Line Items]
Allocation of rebate values, percentage		70.00%
Third Party Software [Member]
Concentration Risk [Line Items]
Percentage of sales from existing distribution agreements on total revenues		3.70%
Subsequent Event [Member]
Concentration Risk [Line Items]
ODAs windows mobile operating system expiration date	Apr. 30, 2022