Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - 2000 Equity Incentive Plan and 2017 Equity Incentive Plan (Details)

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Stock-Based Compensation - 2000 Equity Incentive Plan and 2017 Equity Incentive Plan (Details) - shares
1 Months Ended 6 Months Ended
Jun. 05, 2018
Aug. 29, 2019
Sep. 30, 2019
2000 Equity Incentive Plan and 2017 Equity Incentive Plan | Stock options      
Stockholders' equity      
Vesting period     4 years
Expiration Term     10 years
Portion vesting one year after the issuance date (as a percent)     25.00%
Vesting period after one year of grant     1 year
Portion vesting on first day of each month after one year from the issuance date (as a percent)     2.083%
Vesting period of awards after issuance date     48 months
2000 Plan      
Stockholders' equity      
Number of shares of common stock reserved for issuance     184,900
2017 Plan      
Stockholders' equity      
Number of shares of common stock reserved for issuance     300,000
Number of shares of common stock increased under amended and restated plan 300,000 300,000  
Number of shares available for future grant     523,613
2017 Plan | Maximum      
Stockholders' equity      
Number of shares of common stock increased under amended and restated plan   900,000