Subsequent Events (Details) - 2019 Retention Plan $ / shares in Units, $ in Millions	Jul. 03, 2019 installment $ / shares	Jul. 31, 2019 USD ($)
Options granted In January 2019 | Vesting on January 29, 2020
Subsequent Events
Percentage of options to vest	50.00%
Options granted In January 2019 | Vesting on June 30, 2020
Subsequent Events
Percentage of options to vest	25.00%
Options granted In January 2019 | Vesting on December 31, 2020
Subsequent Events
Percentage of options to vest	25.00%
Subsequent Event
Subsequent Events
Cash portion of the retention plan | $		$ 0.3
Subsequent Event | Options granted in July 2019
Subsequent Events
Stock option exercise price (in dollars per share) | $ / shares	$ 1.48
Number of installments for option to vest | installment	2
Subsequent Event | Options granted in July 2019 | Vesting on July 3, 2020
Subsequent Events
Percentage of options to vest	50.00%
Subsequent Event | Options granted in July 2019 | Vesting on December 31, 2020
Subsequent Events
Percentage of options to vest	50.00%