Commitments and Contingencies - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]
Unapplied purchase commitment due	$ 2,950,000
Unapplied purchase commitment estimated and accrued	110,000
Purchase commitment due	2,840,000
Unapplied purchase commitment due during remainder of 2014	1,510,000
Unapplied purchase commitment non-cancelable contracts	$ 530,000