Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Unapplied purchase commitment due	$ 1,617,000
Unapplied purchase commitment estimated and accrued	444,000
Purchase commitment due	1,173,000
Unapplied purchase commitment due in next twelve months	1,089,000
Unapplied purchase commitment non-cancelable contracts	$ 191,000