Commitments and Contingencies - Additional Information (Detail) - USD ($)		12 Months Ended
	Feb. 17, 2016	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Net rent expense under operating leases		$ 598,900	$ 653,400
Cost of purchasing electricity		$ 771,000
Settlement paid	$ 900,000
Settlement expenses			$ 1,100,000