Stockholders' Equity - Additional information (Details)	3 Months Ended			9 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) item $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Oct. 31, 2021 $ / shares	Aug. 31, 2021 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	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	79,999,997	79,999,997			79,999,997	79,999,997
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 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	$ 0.01	$ 0.01			$ 0.01	$ 0.01
Excess Stock, Shares Authorized	1	1	1	1	1			1	1
Common Stock, Shares, Issued	43,387,563	39,016,012	38,840,508	39,016,012	43,024,424			38,853,433	38,345,540
Common Stock, Shares, Outstanding	36,836,146	32,618,137	32,442,633	32,618,137	36,626,549			32,455,568	32,172,107
Warrant liability | $	$ 1,515,000	$ 1,411,000	$ 3,196,000	$ 1,411,000	$ 1,146,000			$ 3,129,000	$ 830,000
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%
Sale of common stock, net | $		166,000		167,000	7,639,000
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
Common Stock
Sale of common stock, net | $		$ 1,000		$ 2,000	$ 42,000
Shares issued		150,000		150,000	4,144,000
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	2	2			2	2
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01			$ 0.01	$ 0.01
Blank Check Preferred Stock
Preferred Stock, Shares Authorized	40,000,000	40,000,000	40,000,000	40,000,000	40,000,000			40,000,000	40,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01			$ 0.01	$ 0.01