Preferred Stock - Series A Redeemable Convertible Preferred Stock (Details) - USD ($)	1 Months Ended			3 Months Ended	6 Months Ended
	Sep. 30, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Carrying amount in excess of fair value amount	$ 150,000					$ 2,500,000
Forecast | Maximum
Product revenue					$ 22,000,000
Average VWAP of common stock for the 30 days prior to Measurement Date					$ 105.00
Series C perpetual preferred stock
Redemption price per share						$ 8
Series D perpetual preferred stock
Shares issued (in shares)	842,500
Convertible preferred stock, shares outstanding						0	0
Series A
Redemption value						$ 0	$ 12,739,000
Convertible preferred stock, shares outstanding						0	5,524,926
Series A convertible participating preferred stock
Redemption price per share						$ 2.3057
Redemption value							$ 12,700,000
Sagard Capital Partners, L.P. | Series A convertible participating preferred stock
Number of shares issued for each convertible preferred stock			473,565	473,565
Effective conversion price		$ 19.425	$ 194.25
Maximum period from date of issuance			1 year
Iliad | Series C perpetual preferred stock
Preferred stock, par value (in dollars per share)	$ 0.0001
Gross proceeds from the issuance of common stock	$ 2,300,000
Number of shares issued for each convertible preferred stock	842,500
Iliad | Series D perpetual preferred stock
Number of shares issued for each convertible preferred stock	842,500
Iliad | Series A
Number of shares issued for each convertible preferred stock	5,524,926
Second Amendment to Note Purchase Agreement and Notes | Sagard Capital Partners, L.P. | Series A convertible participating preferred stock | Private placement
Shares issued (in shares)			5,524,926
Preferred stock, par value (in dollars per share)			$ 0.0001	$ 0.0001
Gross proceeds from the issuance of common stock				$ 9,200,000
Amount of shares issued				$ 9,000,000