XML 44 R26.htm IDEA: XBRL DOCUMENT v3.7.0.1
Property and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Property Plant And Equipment [Line Items]    
Depreciation and amortization expense $ 200,000 $ 15,000
Minimum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, useful life 3 years  
Maximum    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, useful life 5 years