Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Summary of Stock Unit Activity (Detail)

v3.19.1
Stockholders' Equity - Summary of Stock Unit Activity (Detail) - Restricted Stock Units Deferred Stock Units and Performance Stock Units [Member]
12 Months Ended
Jan. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested Number of Shares at beginning of period | shares 1,924,890
Number of Shares,Granted | shares 616,250
Number of Shares,Vested | shares (277,385)
Number of Shares,Forfeited | shares (567,759)
Unvested Number of Shares at end of period | shares 1,695,996
Unvested Grant-Date Fair Value at beginning of period | $ / shares $ 4.89
Granted Grant-Date Fair Value | $ / shares 1.99
Vested Grant-Date Fair Value | $ / shares 3.45
Forfeited Grant-Date Fair Value | $ / shares 5.35
Unvested Grant-Date Fair value at end of period | $ / shares $ 3.00