Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset measured and recognized at fair value on recurring basis	$ 0		$ 0	$ 0
Earn-out liability				3,510,000
Impairment of goodwill			988,000	0
Identity
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Impairment of goodwill	0	$ 1,000,000
SPA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earn-out consideration				3,510,000
Earn-out liability	3,510,000	$ 3,510,000	$ 3,510,000
Common shares issuance lock-up period			12 months
Maximum | SPA
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Earn-out consideration related to the acquisition				5,000,000
Fair Value, Measurements, Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalent at recurring basis	0		$ 0	0
Fair Value Measurements, Non-recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value liabilities measured and recognized	0		0	0
Fair Value Measurements, Non-recurring | Fair Value, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Privately-held investments measured at fair value	$ 300,000		$ 300,000	$ 300,000