Commitments and Contingencies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Schedule Of Commitments And Contingencies [Line Items]
Capital lease obligation included in other non-current liabilities	$ 147,000		$ 147,000
Operating lease expiration period	2021-07
Corporate apartment lease term expiring period	12 months
Operating leases rent expense	$ 400,000	$ 400,000
Environmental liabilities	0		0
Accounts Payable and Accrued Liabilities
Schedule Of Commitments And Contingencies [Line Items]
Capital lease liabilities	200,000		100,000
Other Long-term Liabilities
Schedule Of Commitments And Contingencies [Line Items]
Capital lease obligation included in other non-current liabilities	$ 200,000		$ 100,000
Software License Arrangement
Schedule Of Commitments And Contingencies [Line Items]
Capital lease agreement	6 years