Stockholders' Equity - Additional information (Details)	3 Months Ended			12 Months Ended
	Mar. 31, 2022 USD ($) item $ / shares shares		Mar. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares		Oct. 31, 2021 $ / shares	Aug. 31, 2021 USD ($)	Dec. 22, 2020 $ / shares	Dec. 31, 2019 USD ($) shares
Capital Stock Shares authorized.	120,000,000
Common Stock, Shares Authorized	79,999,997		79,999,997	79,999,997
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.01	$ 0.01
Special Stock, Shares Authorized	1
Special Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.01	$ 0.01
Excess Stock, Shares Authorized	1		1	1
Common Stock, Shares, Issued	43,387,563		38,840,508	43,024,424
Common Stock, Shares, Outstanding	36,836,146		32,442,633	36,626,549
Warrant liability | $	$ 1,515,000	[1]	$ 3,196,000	$ 1,146,000	[1]
Warrants, term									10 years
Warrants to purchase common stock issued (in shares)									7,179,000
Warrants, Exercise Price (in dollars per share) | $ / shares	$ 4.31					$ 4.31		$ 4.50
Threshold minimum beneficial ownership (as a percent)	5.00%								5.00%
Threshold maximum percentage of issued and outstanding common stock, after exercise of warrants (as a percent)									19.90%
Unrealized gain (loss) on warrants | $	$ 369,000		$ (2,000,000.0)
Number of board members who can be appointed by the warrant holder | item	1
Preemptive rights period	5 years
Share repurchase program, authorized amount | $									$ 5,000,000.0
Share repurchase program, number of shares repurchased (in shares)	250,197
Share repurchase program, average price paid per share (in dollars per share) | $ / shares	$ 1.93
Share repurchase program, approximate dollar value of shares available for purchase | $	$ 4,500,000
Stock repurchase program, shares repurchased, amount | $	$ 483,361
Series A And B Preferred Stock [Member]
Excess Stock, Shares Authorized	1
ATM Program
Stock Issuance Program, Maximum Amount Authorized | $							$ 10,000,000.0
ATM Program | Common Stock
Gross proceeds from issuance of common stock | $				1,400,000
Stock issuance costs, professional and brokerage fees | $				$ 169,000
Value of common stock available for issuance | $	$ 8,600,000
Shares issued	0			701,327
ATM Program | Common Stock | Weighted Average
Share price (in dollars per share) | $ / shares				$ 1.95
Preferred Stock
Preferred Stock, Shares Authorized	2		2	2
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.01	$ 0.01
Blank Check Preferred Stock
Preferred Stock, Shares Authorized	40,000,000		40,000,000	40,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01		$ 0.01	$ 0.01

[1] Amounts are Restated. See Note 3 for more information.