Class A Redeemable Convertible Preferred Stock - Schedule of Series A Preferred Stock Accretion of Ten Year Liquidation Value (Detail) - Series A Redeemable Convertible Preferred Stock [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 30, 2015
Temporary Equity [Line Items]
Fair Value	$ 73,200	$ 73,200
10 Year Liquidation Value	190,816
Anniversary of Closing Date Year 1 [Member]
Temporary Equity [Line Items]
Fair Value	73,200
Deemed Dividends	7,360
10 Year Liquidation Value	80,560
Anniversary of Closing Date Year 2 [Member]
Temporary Equity [Line Items]
Fair Value	80,560
Deemed Dividends	8,101
10 Year Liquidation Value	88,661
Anniversary of Closing Date Year 3 [Member]
Temporary Equity [Line Items]
Fair Value	88,661
Deemed Dividends	8,915
10 Year Liquidation Value	97,576
Anniversary of Closing Date Year 4 [Member]
Temporary Equity [Line Items]
Fair Value	97,576
Deemed Dividends	9,811
10 Year Liquidation Value	107,387
Anniversary of Closing Date Year 5 [Member]
Temporary Equity [Line Items]
Fair Value	107,387
Deemed Dividends	10,798
10 Year Liquidation Value	118,185
Year 6 Anniversary of Closing Date [Member]
Temporary Equity [Line Items]
Fair Value	118,185
Deemed Dividends	11,884
10 Year Liquidation Value	130,069
Anniversary of Closing Date Year 7 [Member]
Temporary Equity [Line Items]
Fair Value	130,069
Deemed Dividends	13,078
10 Year Liquidation Value	143,147
Anniversary of Closing Date Year 8 [Member]
Temporary Equity [Line Items]
Fair Value	143,147
Deemed Dividends	14,394
10 Year Liquidation Value	157,541
Anniversary of Closing Date Year 9 [Member]
Temporary Equity [Line Items]
Fair Value	157,541
Deemed Dividends	15,841
10 Year Liquidation Value	173,382
Anniversary of Closing Date Year 10 [Member]
Temporary Equity [Line Items]
Fair Value	173,382
Deemed Dividends	17,434
10 Year Liquidation Value	$ 190,816