Description of Business and Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Summary Of Business And Accounting Policies [Line Items]
Entity incorporation date	1994-07
Common stock equivalent shares excluded from computations of basic and diluted income per share	213,820	901,069
Letter of credit expiration year	2020
Capitalized software development costs	$ 0	$ 0
Advertising expense	23,000	558,000
ASU No. 2015-17 [Member]
Summary Of Business And Accounting Policies [Line Items]
Reclassification of current deferred tax asset to noncurrent deferred tax asset		$ 10,000
Japan [Member]
Summary Of Business And Accounting Policies [Line Items]
Increase in valuation allowance against deferred tax assets warranted	$ 100,000
Office furniture and equipment [Member]
Summary Of Business And Accounting Policies [Line Items]
Leasehold improvements estimated useful life	3 years
Minimum [Member]
Summary Of Business And Accounting Policies [Line Items]
Intangible assets useful life range	1 year
Minimum [Member] | Leasehold improvements [Member]
Summary Of Business And Accounting Policies [Line Items]
Leasehold improvements estimated useful life	2 years
Maximum [Member]
Summary Of Business And Accounting Policies [Line Items]
Intangible assets useful life range	10 years
Maximum [Member] | Leasehold improvements [Member]
Summary Of Business And Accounting Policies [Line Items]
Leasehold improvements estimated useful life	10 years