Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details)

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Summary of Significant Accounting Policies (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Debt Instrument [Line Items]      
Restricted shares subject to repurchase for unvested shares related to early option exercises under stock equity plans (in shares) 4,689 6,219  
Senior convertible note      
Debt Instrument [Line Items]      
Interest rate of notes (as a percent) 7.00%   7.00%
Principal amount of note $ 3,000,000   $ 3,000,000
Estimated net cash proceeds $ 2,760,000