Commitments and Contingencies - Additional Information (Detail)	1 Months Ended		12 Months Ended
	Mar. 31, 2008 USD ($) CreditFacility	Feb. 29, 2008	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2008 facility
Loss Contingencies [Line Items]
Number of facilities | facility						2
Rent expenses			$ 3,100,000	$ 3,400,000	$ 3,800,000
Lease agreement [Member]
Loss Contingencies [Line Items]
Fixed annual rate			3.00%
Security deposit	$ 293,200
Lease rent abated	$ 38,480
Letter of credit issued for security deposit | CreditFacility	2
Tenant improvement allowance			$ 1,100,000
Lease agreement [Member] | First year [Member]
Loss Contingencies [Line Items]
Rent payable for leases	$ 73,500
Lease agreement [Member] | Final year [Member]
Loss Contingencies [Line Items]
Rent payable for leases			$ 93,000
Sublease [Member]
Loss Contingencies [Line Items]
Fixed annual rate			2.50%
Security deposit			$ 93,500
Sublease [Member] | First year [Member]
Loss Contingencies [Line Items]
Rent payable final year of Sublease			80,500
Sublease [Member] | Final year [Member]
Loss Contingencies [Line Items]
Rent payable final year of Sublease			$ 93,500
Minimum [Member] | Lease agreement [Member]
Loss Contingencies [Line Items]
Rent abatement period	2 months
Minimum [Member] | Sublease [Member]
Loss Contingencies [Line Items]
Rent abatement period		1 month
Maximum [Member] | Lease agreement [Member]
Loss Contingencies [Line Items]
Rent abatement period	8 months
Maximum [Member] | Sublease [Member]
Loss Contingencies [Line Items]
Rent abatement period		7 months