Liquidity and Going Concern Uncertainty - Issuance Pursuant to Prospectus (Details) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020
Line of Credit Facility [Line Items]
Issuance costs	$ 896
Proceeds from stock issuance, net of issuance costs	$ 11,504	$ 11,504	$ 0
Public Offering
Line of Credit Facility [Line Items]
Sale of stock, price per share (in dollars per share)	$ 4.00	$ 4.00
Common Stock | Private Placement
Line of Credit Facility [Line Items]
Sale of stock, price per share (in dollars per share)	$ 4.40	4.40
Proceeds from issuance of common stock gross	$ 12,400
Common Stock | Public Offering
Line of Credit Facility [Line Items]
Number of shares closed in transaction (in shares)	4,000,000
Sale of stock, price per share (in dollars per share)	$ 4.00	4.00
Warrants | Private Placement
Line of Credit Facility [Line Items]
Number of shares closed in transaction (in shares)	3,000,000
Sale of stock, price per share (in dollars per share)	$ 4.40	$ 4.40
Warrants | Public Offering
Line of Credit Facility [Line Items]
Number of shares closed in transaction (in shares)	1,000,000