Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($) Customer
Accounting Policies [Line Items]
Capitalized software development costs	$ 200,000	$ 0
Amortization expense	$ 1,455,000	$ 1,455,000
Concentration Risk, Customer	No customer accounted for more than 10% of net revenue for the years ended December 31, 2017 and 2016, respectively. No customer accounted for more than 10% of the Company’s accounts receivable balance at December 31, 2017 or 2016.
Number of major customer represented stated percentage of total net revenue | Customer	0	0
Number of customers who accounted for more than 10% accounts receivable balance | Customer	0	0
Foreign currency translation and transactions gains (losses)	$ (400,000)
Maximum
Accounting Policies [Line Items]
Foreign currency translation and transactions gains (losses)		$ 100,000
Furniture, Fixtures and Office Equipment | Minimum
Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Furniture, Fixtures and Office Equipment | Maximum
Accounting Policies [Line Items]
Property and equipment, estimated useful lives	10 years
Plant and Machinery | Minimum
Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years
Plant and Machinery | Maximum
Accounting Policies [Line Items]
Property and equipment, estimated useful lives	7 years
Automobiles
Accounting Policies [Line Items]
Property and equipment, estimated useful lives	5 years
Purchased Software
Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Research and Development
Accounting Policies [Line Items]
Estimated useful life, Internal-use software	3 years
Amortization expense	$ 200,000	$ 400,000