Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Details)

v3.19.2
Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
May 22, 2019
May 14, 2019
May 13, 2019
May 10, 2019
Mar. 31, 2019
2019 Employee Stock Purchase Plan          
Subsequent Event [Line Items]          
Common stock reserved for issuance description         Additionally, the number of shares of common stock reserved for issuance under the 2019 Employee Stock Purchase Plan will automatically increase on January 1 of each calendar year for 10 years, starting January 1, 2020, and ending on, and including, January 1, 2029, in an amount equal to the lesser of 1% of the total number of shares of capital stock outstanding on December 31st of the prior calendar year, and (ii) 500,000 shares, unless the board of directors or compensation committee determines prior to such date that there will be a lesser increase, or no increase.
2019 Plan          
Subsequent Event [Line Items]          
Common stock reserved for issuance description         1,885,039 shares of common stock are reserved for future issuance under the 2019 Equity Incentive Plan, plus the number of shares subject to outstanding stock options or other stock awards that were granted under the Option Plan that are forfeited, terminated, expire or are otherwise not issued. Additionally, the number of shares of common stock reserved for issuance under the 2019 Equity Incentive Plan will automatically increase on January 1 of each calendar year for 10 years, starting January 1, 2020 and ending on and including January 1, 2029, in an amount equal to 5% of the total number of shares of capital stock outstanding on December 31 of the prior calendar year, unless the board of directors or compensation committee determines prior to the date of increase that there will be a lesser increase, or no increase.
Subsequent Event          
Subsequent Event [Line Items]          
IPO closing date   May 14, 2019      
Subsequent Event | 2019 Employee Stock Purchase Plan          
Subsequent Event [Line Items]          
Common stock, number of shares available for sale   337,007      
Period in which reserved shares will increase annually   10 years      
Increase in common stock reserved for issuance as a percentage of total number of shares of capital stock outstanding on the last day of the prior calendar year   1.00%      
Increase In common stock reserved for issuance of number of shares of capital stock outstanding on last day of prior calendar year   500,000      
Subsequent Event | 2019 Plan          
Subsequent Event [Line Items]          
Common stock, number of shares available for sale   1,885,039      
Period in which reserved shares will increase annually   10 years      
Increase in common stock reserved for issuance as a percentage of total number of shares of capital stock outstanding on the last day of the prior calendar year   5.00%      
Common Stock          
Subsequent Event [Line Items]          
Shares issued and sold         227,628
Common Stock | Subsequent Event          
Subsequent Event [Line Items]          
Shares issued upon exercise of warrants       155,338  
Proceeds from issuance of shares upon exercise of warrants       $ 23  
Common Stock | Subsequent Event | Chief Executive Officer          
Subsequent Event [Line Items]          
Restricted stock award, fully vested shares     383,197    
Restricted stock award, net shares issued     210,758    
Restricted stock award, shares withheld to satisfy tax obligations     172,439    
Common Stock | IPO | Subsequent Event          
Subsequent Event [Line Items]          
Shares issued and sold 505,714 3,571,429      
Shares issued and sold, price per share $ 11.00 $ 11.00      
Net proceeds from issuance of IPO $ 37,606        
Underwriting discounts and commissions 3,139        
Offering expenses paid $ 4,102        
Common Stock | Over-Allotment | Subsequent Event          
Subsequent Event [Line Items]          
Shares issued and sold 30,000        
Shares issued and sold, price per share $ 11.00