Equity - Down Round Features (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2019 $ / shares
Equity
Down round adjustment for convertible preferred stock and warrants	$ 3,079
Down round adjustment for convertible preferred stock	200
Down round adjustment for warrants	$ 2,900
Warrant with down round features
Equity
Exercise price of warrants (in dollars per share) | $ / shares		$ 2.40
Warrant with down round features | Risk-free interest rate | Minimum
Equity
Warrant fair value measurement inputs (as a percent)	2.13
Warrant with down round features | Risk-free interest rate | Maximum
Equity
Warrant fair value measurement inputs (as a percent)	2.96
Warrant with down round features | Expected term | Minimum
Equity
Warrants term	1 year
Warrant with down round features | Expected term | Maximum
Equity
Warrants term	9 years 4 months 24 days
Warrant with down round features | Expected dividends
Equity
Warrant fair value measurement inputs (as a percent)	0.00
Warrant with down round features | Expected volatility | Minimum
Equity
Warrant fair value measurement inputs (as a percent)	111.63
Warrant with down round features | Expected volatility | Maximum
Equity
Warrant fair value measurement inputs (as a percent)	293.32