Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	May 11, 2022
Stock Options, Additional Disclosures
Stock options outstanding	1,094,999	1,094,999	974,999
Outstanding, Number, Beginning Balance (in shares)		974,999
Granted (in shares)		180,000
Forfeited/Cancelled (in shares)		(60,000)
Outstanding, Number, Ending Balance (in shares)	1,094,999	1,094,999	974,999
Vested and expected to vest (in shares)	1,094,999	1,094,999
Options Exercisable (in share)	223,887	223,887
Outstanding, Weighted Average Exercise Price, Beginning Balance (in dollars per share)		$ 3.99
Granted (in dollars per share)		0.59
Forfeited/Cancelled (in dollars per share)		6.04
Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)	$ 3.32	3.32	$ 3.99
Vested and expected to vest (in dollars per share)	3.32	3.32
Options Exercisable (in dollars per share)	$ 7.95	$ 7.95
Options, Outstanding, Weighted Average Remaining Contractual Term (years)		9 years	9 years 3 months 18 days
Vested and expected to vest (years)		9 years
Options Exercisable (years)		7 years 8 months 12 days
Options, Outstanding, Aggregate Intrinsic Value	$ 1	$ 1
Vested and expected to vest, Aggregate Intrinsic Value	$ 1	$ 1
2018 Plan
Stock Options, Additional Disclosures
Stock options outstanding				0
Stock options | Employees, Directors And Consultants
Stock Options, Additional Disclosures
Granted (in shares)		0
Stock options | Non Employee Director
Stock Options, Additional Disclosures
Granted (in shares)	140,000	180,000
Weighted average fair value per share of options granted	$ 0.33	$ 0.41
Minimum | Stock options | Non Employee Director
Stock Options, Additional Disclosures
Vesting period	1 year	1 year
Maximum | Stock options | 2019 Plan
Stock Options, Additional Disclosures
Expiration period		10 years
Maximum | Stock options | Non Employee Director
Stock Options, Additional Disclosures
Vesting period	3 years	3 years