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Summary of Common Stock Reserved for Future Issuance (Detail)
Mar. 31, 2020
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Common stock reserved for future issuance 10,123,483
Exercise of Outstanding Stock Options, Vesting of Restricted Stock Units ("RSU"), and Issuance of RSUs Vested but not Released  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Common stock reserved for future issuance 1,835,402
ESPP  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Common stock reserved for future issuance 293,888
Shares of Common Stock Available for Grant Under the 2011 Plan  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Common stock reserved for future issuance 412,744
Warrants to Purchase Common Stock  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Common stock reserved for future issuance 40,000
Shares of Common Stock Issuable Upon Conversion of Series B Convertible Preferred Stock  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Common stock reserved for future issuance 7,541,449