Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plans and Stock Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plan (Parenthetical) (Detail)

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Equity Incentive Plans and Stock Based Compensation - Summary of Stock Option Activity Under Equity Incentive Plan (Parenthetical) (Detail)
Aug. 01, 2017
shares
Private Molecular  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Threshold Pharmaceuticals, Inc. options assumed in merger with Molecular Templates, Inc. 963,681