Annual report pursuant to Section 13 and 15(d)

Stock and Employee Benefit Plans- Schedule of Information Regarding Stock Option Plans (Detail)

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Stock and Employee Benefit Plans- Schedule of Information Regarding Stock Option Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 29, 2016
Dec. 31, 2016
Dec. 31, 2015
2014 Stock Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Number of shares, Outstanding at beginning balance   2,707,329  
Number of shares, Options granted 0 1,157,734 755,329
Number of shares, Forfeited   (140,000)  
Number of shares, Outstanding at ending balance   3,725,063 2,707,329
Number of shares, Vested or expected to vest   3,725,063  
Number of shares, Exercisable at ending balance   1,961,811  
Weighted-Average Exercise Price, Outstanding at beginning balance   $ 2.05  
Weighted-Average Exercise Price, Options granted   1.57  
Weighted-Average Exercise Price, Forfeited   1.71  
Weighted-Average Exercise Price, Outstanding ending balance   1.91 $ 2.05
Weighted-Average Exercise Price, Vested or expected to vest   1.91  
Weighted-Average Exercise Price, Exercisable at ending balance   $ 2.01  
Weighted Average Remaining Contractual Life, Outstanding   8 years 6 months 18 days 9 years 2 months 1 day
Weighted Average Remaining Contractual Life, Vested or expected to vest   8 years 6 months 18 days  
Weighted Average Remaining Contractual Life, Exercisable   7 years 11 months 27 days  
Aggregate Intrinsic Value, Outstanding   $ 741  
Aggregate Intrinsic Value, Outstanding   741  
Aggregate Intrinsic Value, Vested or expect to vest   0  
Aggregate Intrinsic Value, Exercisable   $ 0  
2016 Stock Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Number of shares, Options granted   715,313 0
Number of shares, Forfeited   (90,000)  
Number of shares, Outstanding at ending balance   715,313  
Number of shares, Vested or expected to vest   715,313  
Number of shares, Exercisable at ending balance   228,774  
Weighted-Average Exercise Price, Options granted   $ 2.36  
Weighted-Average Exercise Price, Outstanding ending balance   2.36  
Weighted-Average Exercise Price, Vested or expected to vest   2.36  
Weighted-Average Exercise Price, Exercisable at ending balance   $ 2.46  
Weighted Average Remaining Contractual Life, Outstanding   9 years 7 months 13 days 0 years
Weighted Average Remaining Contractual Life, Vested or expected to vest   9 years 7 months 13 days  
Weighted Average Remaining Contractual Life, Exercisable   8 years 10 months 24 days  
Aggregate Intrinsic Value, Vested or expect to vest   $ 0  
Aggregate Intrinsic Value, Exercisable   $ 0