Summary of Significant Accounting Policies - Schedule of Stock-Based Compensation Expense Allocation (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 607,000	$ 475,000	$ 668,000
Cost of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	44,000	14,000	23,000
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	28,000
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	2,000		40,000
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 533,000	$ 461,000	$ 605,000