Stockholders' Equity - Preferred Stock (Details)	Sep. 30, 2021 $ / shares shares	Jun. 02, 2021	Dec. 31, 2020 $ / shares shares
Preferred Stock
Preferred stock, authorized (in shares)	5,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.001
Series X redeemable convertible preferred stock
Preferred Stock
Preferred stock, authorized (in shares)	36,758		36,758
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.001		$ 0.001
Preferred stock, outstanding (in shares)	31,455		0
Number of common shares issuable upon conversion of preferred stock (in shares)	5,242,501
Number of shares of common stock into which each share of Series X Preferred Stock may be converted	166.67	166.67