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Employee Benefit Plans and Stock-based Compensation - Summary of Company's Stock Option and Restricted Stock Unit Activity (Detail)
shares in Thousands
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Available for Grant, Beginning balance 3,912
Shares Available for Grant, Authorized 7,400
Shares Available for Grant, Granted (4,008)
Shares Available for Grant, Forfeited or cancelled 1,584
Shares Available for Grant, Ending balance 8,888
Restricted Stock Units Outstanding [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Units, Beginning balance 3,864
Shares Available for Grant, Authorized 0
Number of Units, Granted 2,651
Number of Units, exercised 0
Number of Units, Shares released (1,883)
Number of Units, Forfeited or cancelled (744)
Number of Units, Ending balance 3,888
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares $ 4.26
Weighted Average Grant Date Fair Value, Authorized | $ / shares 0.00
Estimated weighted average fair value per share at purchase date | $ / shares 5.46
Weighted Average Grant Date Fair Value, Exercised | $ / shares
Weighted Average Grant Date Fair Value, Shares released | $ / shares 3.92
Weighted Average Grant Date Fair Value, Forfeited or cancelled | $ / shares 4.96
Weighted Average Grant Date Fair Value, Ending balance | $ / shares $ 5.11
Stock Options Outstanding [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares Available for Grant, Authorized 0
Number of Shares, Beginning balance 5,019
Number of Shares, Granted 30
Number of Shares, Options exercised (94)
Number of Shares, Forfeited or cancelled (469)
Number of Shares, Ending balance 4,486
Weighted Average Exercise Price, Beginning balance | $ / shares $ 6.01
Weighted Average Exercise Price, Authorized | $ / shares 0.00
Weighted Average Exercise Price, Granted | $ / shares 5.10
Weighted Average Exercise Price, Options exercised | $ / shares 3.06
Weighted Average Exercise Price, Forfeited or cancelled | $ / shares 6.13
Weighted Average Exercise Price, Ending balance | $ / shares $ 6.06