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Stock-Based Compensation - Summary of Significant Ranges of Outstanding and Exercisable Options (Detail) - Options
$ / shares in Units, shares in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
$0.18 - $0.74  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 0.18
Upper range limit (in dollars per share) $ 0.74
Number Outstanding (in shares | shares 1,297
Weighted Average Remaining Contractual Life 9 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share) $ 0.20
Number Exercisable (in shares | shares 122
Weighted Average Exercise Price (in dollars per share) $ 0.20
Aggregate Intrinsic value | $ $ 0
$0.75 - $1.27  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 0.75
Upper range limit (in dollars per share) $ 1.27
Number Outstanding (in shares | shares 160
Weighted Average Remaining Contractual Life 4 years 3 months 21 days
Weighted Average Exercise Price (in dollars per share) $ 0.75
Number Exercisable (in shares | shares 53
Weighted Average Exercise Price (in dollars per share) $ 0.75
Aggregate Intrinsic value | $ $ 0
$1.28 - $7.19  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 1.28
Upper range limit (in dollars per share) $ 7.19
Number Outstanding (in shares | shares 51
Weighted Average Remaining Contractual Life 5 years 29 days
Weighted Average Exercise Price (in dollars per share) $ 2.09
Number Exercisable (in shares | shares 23
Weighted Average Exercise Price (in dollars per share) $ 2.94
Aggregate Intrinsic value | $ $ 0
$7.20 - $20.49  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 7.20
Upper range limit (in dollars per share) $ 20.49
Number Outstanding (in shares | shares 101
Weighted Average Remaining Contractual Life 7 years 1 month 24 days
Weighted Average Exercise Price (in dollars per share) $ 7.20
Number Exercisable (in shares | shares 96
Weighted Average Exercise Price (in dollars per share) $ 7.20
Aggregate Intrinsic value | $ $ 0
$20.50 - $46.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 20.50
Upper range limit (in dollars per share) $ 46.20
Number Outstanding (in shares | shares 19
Weighted Average Remaining Contractual Life 5 years 8 months 8 days
Weighted Average Exercise Price (in dollars per share) $ 21.53
Number Exercisable (in shares | shares 19
Weighted Average Exercise Price (in dollars per share) $ 21.53
Aggregate Intrinsic value | $ $ 0
$0.18 - $46.20  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Lower range limit (in dollars per share) $ 0.18
Upper range limit (in dollars per share) $ 46.20
Number Outstanding (in shares | shares 1,628
Weighted Average Remaining Contractual Life 8 years 8 months 26 days
Weighted Average Exercise Price (in dollars per share) $ 1.00
Number Exercisable (in shares | shares 313
Weighted Average Exercise Price (in dollars per share) $ 3.94
Aggregate Intrinsic value | $ $ 0