Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, Gross Carrying Amount	$ 6,161	$ 6,161
Total intangible assets, Accumulated Amortization	649	1,947
Total intangible assets, Net	$ 5,512	4,214
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, Weighted Average Amortization Period (Years)	4 years 6 months
Total intangible assets, Gross Carrying Amount	$ 272	272
Total intangible assets, Accumulated Amortization	30	91
Total intangible assets, Net	$ 242	181
Customer backlog
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, Weighted Average Amortization Period (Years)	1 year 6 months
Total intangible assets, Gross Carrying Amount	$ 93	93
Total intangible assets, Accumulated Amortization	31	93
Total intangible assets, Net	$ 62
Core technologies
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, Weighted Average Amortization Period (Years)	5 years 1 month 6 days
Total intangible assets, Gross Carrying Amount	$ 5,796	5,796
Total intangible assets, Accumulated Amortization	588	1,763
Total intangible assets, Net	$ 5,208	$ 4,033