Redeemable Convertible Preferred Stock (Details) - USD ($)	Dec. 23, 2019	Mar. 31, 2020
Temporary Equity
Aggregate gross proceeds	$ 3,900,000
Preferred Shares		263,521
Aggregate Purchase Price		$ 45,000,272
Gross proceeds	$ 6,200,000
Common stock trading Price	$ 7.60
Common stock trading Price, Number of trading days	20 days
Common stock trading Price, Number of trading days Subsequent to closing	30 days
Aggregate gross proceeds	$ 87,600,000
Series B1 redeemable convertible preferred stock (Note 7); Designated — 278 shares, Issued and outstanding — 24 shares at March 31, 2020 and December 31, 2019
Temporary Equity
Sale of redeemable convertible preferred stock	23,684
Series B1 redeemable convertible preferred stock (Note 7); Designated — 278 shares, Issued and outstanding — 24 shares at March 31, 2020 and December 31, 2019 | Common stock warrants
Temporary Equity
Warrant to purchase common stock	2,368,400
Warrant exercise price (per share)	$ 1.52
Series B1 redeemable convertible preferred stock (Note 7); Designated — 278 shares, Issued and outstanding — 24 shares at March 31, 2020 and December 31, 2019 | Preferred Stock Warrant
Temporary Equity
Warrant to purchase common stock	23,684
Warrant exercise price (per share)	$ 152
Series B2 Redeemable Convertible Preferred Stock
Temporary Equity
Preferred Shares		98,685
Share Price		$ 152
Aggregate Purchase Price		$ 15,000,120
Expiration period	9 months
Series B2 Redeemable Convertible Preferred Stock | Common stock warrants
Temporary Equity
Sale of redeemable convertible preferred stock	9,868,500
Warrant exercise price (per share)	$ 1.52
Series B2 Redeemable Convertible Preferred Stock | Preferred Stock Warrant
Temporary Equity
Warrant to purchase common stock	98,685
Warrant exercise price (per share)	$ 152
Series B3 Redeemable Convertible Preferred Stock
Temporary Equity
Preferred Shares		82,418
Share Price		$ 182
Aggregate Purchase Price		$ 15,000,076
Expiration period	15 months
Series B3 Redeemable Convertible Preferred Stock | Common stock warrants
Temporary Equity
Warrant to purchase common stock	6,593,440
Warrant exercise price (per share)	$ 1.82
Series B3 Redeemable Convertible Preferred Stock | Preferred Stock Warrant
Temporary Equity
Warrant to purchase common stock	65,934
Warrant exercise price (per share)	$ 182
Series B4 Redeemable Convertible Preferred Stock
Temporary Equity
Preferred Shares		82,418
Share Price		$ 182
Aggregate Purchase Price		$ 15,000,076
Expiration period	21 months