Debt - Convertible Notes (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			30 Months Ended
		Jan. 16, 2020	Mar. 29, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2021	Sep. 30, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Accumulated interest on subordinated debt		$ 100
Preferred stock, par value (in usd per share)								$ 0.0001	$ 0.0001
Conversion of notes to preferred stock (in shares)	[1]			22,000
Preferred Stock
Line of Credit Facility [Line Items]
Conversion of notes to preferred stock (in shares)				111,548	2,709,000
Common Stock
Line of Credit Facility [Line Items]
Conversion of notes to preferred stock (in shares)				22,310
Subsequent Event
Line of Credit Facility [Line Items]
Interest rate on convertible notes							10.00%
Convertible Debt
Line of Credit Facility [Line Items]
Proceeds from issuance of subordinated convertible promissory notes			$ 1,700
Interest rate on convertible notes						5.00%
Unamortized issuance costs at date of issuance		40
Net proceeds from the conversion of convertible debt to preferred stock		$ 1,800
Conversion rate (in dollars per share)		$ 0.67
Conversion of notes to preferred stock (in shares)		2,709,018

[1] * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.