Commitments and Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule Of Commitments And Contingencies [Line Items]
Capital lease obligation included in other non-current liabilities	$ 147,000		$ 147,000		$ 144,000
Operating lease expiration period			2021-07
Corporate apartment lease term expiring period			12 months
Operating leases rent expense	100,000	$ 100,000	$ 300,000	$ 400,000
Environmental liabilities	0		0		0
Accounts Payable and Accrued Liabilities
Schedule Of Commitments And Contingencies [Line Items]
Capital lease liabilities	100,000		100,000		100,000
Other Long-term Liabilities
Schedule Of Commitments And Contingencies [Line Items]
Capital lease obligation included in other non-current liabilities	$ 100,000		$ 100,000		$ 100,000
Software License Arrangement
Schedule Of Commitments And Contingencies [Line Items]
Capital lease agreement			6 years