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Common stock and preferred stock (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of Future Issuance of Common Stock Shares The Company has reserved for future issuance the following number of shares of common stock (in thousands):
As of December 31,
20192018
Options to purchase common stock5,483  4,643  
Restricted stock units1,127  931  
2013 Stock Option and Incentive Plan2,007  1,458  
2013 Employee Stock Purchase Plan147  172  
8,764  7,204