Commitments and Contingencies (Leases) - Additional Information (Detail) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2015	Feb. 28, 2015 ft²	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Other Commitments [Line Items]
Leases expiration date	Jul. 31, 2018
Exit cost						$ 133
Operating service agreement period						30 days
Rental expense			$ 174	$ 181	$ 347	$ 487
Sublease [Member]
Other Commitments [Line Items]
Area of office space | ft²		15,981
Leases expiration date					Dec. 31, 2016