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 Originally Issued and Remaining Series A Preferred Stock Accretion to Ten Year Liquidation Value (Detail)

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Class A Redeemable Convertible Preferred Stock - Schedule of Originally Issued and Remaining Series A Preferred Stock Accretion to Ten Year Liquidation Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 30, 2015
Temporary Equity [Line Items]      
10 Year Liquidation Value $ 85,900 $ 190,800  
Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock 12,816 28,480 $ 28,480
Fair Value     $ 73,200
Deemed Dividends 3,312 7,360  
Anniversary Of Closing Date Year One | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   73,200  
Fair Value 32,940    
Deemed Dividends 3,312 7,360  
10 Year Liquidation Value 36,252 80,560  
Anniversary Of Closing Date Year Two | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   80,560  
Fair Value 36,252    
Deemed Dividends 3,645 8,101  
10 Year Liquidation Value 39,897 88,661  
Anniversary Of Closing Date Year Three | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   88,661  
Fair Value 39,897    
Deemed Dividends 4,012 8,915  
10 Year Liquidation Value 43,909 97,576  
Anniversary of Closing Date Year 4 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   97,576  
Fair Value 43,909    
Deemed Dividends 4,415 9,811  
10 Year Liquidation Value 48,324 107,387  
Anniversary of Closing Date Year 5 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   107,387  
Fair Value 48,324    
Deemed Dividends 4,859 10,798  
10 Year Liquidation Value 53,183 118,185  
Anniversary of Closing Date Year 6 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   118,185  
Fair Value 53,183    
Deemed Dividends 5,348 11,884  
10 Year Liquidation Value 58,531 130,069  
Anniversary of Closing Date Year 7 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   130,069  
Fair Value 58,531    
Deemed Dividends 5,885 13,078  
10 Year Liquidation Value 64,416 143,147  
Anniversary of Closing Date Year 8 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   143,147  
Fair Value 64,416    
Deemed Dividends 6,477 14,394  
10 Year Liquidation Value 70,893 157,541  
Anniversary of Closing Date Year 9 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   157,541  
Fair Value 70,893    
Deemed Dividends 7,128 15,841  
10 Year Liquidation Value 78,021 173,382  
Anniversary of Closing Date Year 10 [Member] | Series A Redeemable Convertible Preferred Stock [Member]      
Temporary Equity [Line Items]      
Carrying amount of preferred stock   173,382  
Fair Value 78,021    
Deemed Dividends 7,846 17,434  
10 Year Liquidation Value $ 85,867 $ 190,816