Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.6.0.2
Related-Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Former Member of Board of Directors [Member]    
Related Party Transaction [Line Items]    
Advisory fee paid to related party $ 60,000 $ 60,000