Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Class A Redeemable Convertible Preferred Stock - Schedule of Redemption Discounts (Detail)

v3.6.0.2
Class A Redeemable Convertible Preferred Stock - Schedule of Redemption Discounts (Detail) - Series A Redeemable Convertible Preferred Stock [Member]
12 Months Ended
Dec. 22, 2016
Dec. 31, 2016
Temporary Equity [Line Items]    
Redemption Discount 9.0909%  
Commencing on the Original Issue Date and Ending on the 1st Anniversary of Original Issue Date [Member]    
Temporary Equity [Line Items]    
Redemption Discount   9.0909%
Commencing on the Day After the 1st Anniversary of the Original Issue Date and Ending on the 2nd Anniversary of the Original Issue Date [Member]    
Temporary Equity [Line Items]    
Redemption Discount   6.8182%
Commencing on the Day After the 2nd Anniversary of the Original Issue Date and Ending on the 3rd Anniversary of the Original Issue Date [Member]    
Temporary Equity [Line Items]    
Redemption Discount   4.5455%
Commencing on the Day After the 3rd Anniversary of the Original Issue Date and Ending on the 4th Anniversary of the Original Issue Date [Member]    
Temporary Equity [Line Items]    
Redemption Discount   2.2727%