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Stockholders' Equity - Summary of Stock Option Activity (Detail)
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding Beginning Balance, Number of Shares | shares 2,445,453
Granted, Number of Shares | shares 918,052
Canceled/Forfeited, Number of Shares | shares (17,458)
Outstanding Ending Balance, Number of Shares | shares 3,346,047
Outstanding Beginning Balance, Weighted-Average Exercise Price Per Share $ 3.37
Granted, Weighted-Average Exercise Price Per Share 1.53
Canceled/Forfeited, Weighted-Average Exercise Price Per Share 3.18
Outstanding Ending Balance, Weighted-Average Exercise Price Per Share 2.86
Outstanding, 1.17 — 23.20 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.17
Exercise Price Per Share, Maximum 23.20
Granted, 1.35 — 2.32 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.35
Exercise Price Per Share, Maximum 2.32
Canceled/Forfeited, 1.51 — 16.40 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.51
Exercise Price Per Share, Maximum 16.40
Outstanding, 1.17 — 23.20 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise Price Per Share, Minimum 1.17
Exercise Price Per Share, Maximum $ 23.20