Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.7.0.1
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 08, 2013
ft²
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Loss Contingencies [Line Items]          
Rent expenses | $   $ 0.1 $ 0.1 $ 0.2 $ 0.2
Lease Facility [Member]          
Loss Contingencies [Line Items]          
Area of office space | ft² 8,894        
Lease start date Jan. 16, 2014        
Lease expiration date Dec. 31, 2018