Long-term Investment - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Investment [Line Items]
Investment in available-for-sale equity security	$ 18,000	$ 37,000
Cost basis in our available-for-sale security	19,000	19,000
Unrealized (losses) gains in accumulated other comprehensive income	$ (1,000)	$ 18,000