Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions				1 Months Ended
	Jun. 24, 2022	Nov. 23, 2021 shares	Jan. 22, 2020 shares	Jun. 30, 2022	Nov. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares	May 31, 2019 $ / shares shares	Mar. 31, 2023 vote shares	Dec. 31, 2022 shares	Oct. 31, 2022 shares	Mar. 31, 2022 shares
Subsidiary, Sale of Stock [Line Items]
Common stock, shares outstanding (in shares)									16,859,733	16,840,261
Common stock voting rights votes | vote									1
Reverse stock split ratio	0.1
Total common shares reserved for future issuance (in shares)									15,097,000
2021 Closing
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)					5,892,335
Sale of stock price (in usd per share) | $ / shares					$ 3.60
Consideration received | $					$ 34.6
Shares issued upon conversion (in shares)					1
Private Placement
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)						2,434,152		973,045
Nonvoting convertible preferred stock issued (in shares)								415,898
Warrants callable (in shares)						2,030,341
Class of warrant								5 years
Class A-4 Convertible Preferred Stock | 2021 Closing
Subsidiary, Sale of Stock [Line Items]
Sale of stock price (in usd per share) | $ / shares					$ 3.60
Nonvoting convertible preferred stock issued (in shares)					3,725,720
Class A-1 Convertible Preferred Stock | Private Placement
Subsidiary, Sale of Stock [Line Items]
Warrants callable (in shares)								1,388,943
Preferred Class A | Private Placement
Subsidiary, Sale of Stock [Line Items]
Sale of stock price (in usd per share) | $ / shares								$ 10.80
Shares issued upon conversion (in shares)								1
Class A-2 Convertible Preferred Stock | 2019 PIPE Milestone Closing warrants
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)							3,288,390
Shares issued upon conversion (in shares)							1
Warrants callable (in shares)							3,288,390
Class of warrant							5 years
Warrant exercise price (in usd per share) | $ / shares							$ 6.66
Class A-3 Convertible Preferred Stock | Private Placement
Subsidiary, Sale of Stock [Line Items]
Nonvoting convertible preferred stock issued (in shares)						272,970
Shares issued upon conversion (in shares)						1
Class of warrant						5 years
Warrant exercise price (in usd per share) | $ / shares						$ 7.46
Directors, Executive Officers and Employees | 2021 Closing
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)					222,222
Directors, Executive Officers and Employees | Class A-4 Convertible Preferred Stock | 2021 Closing
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of right to purchase common shares | $					$ 0.8
2019 Plan
Subsidiary, Sale of Stock [Line Items]
Number of additional shares authorized (in shares)			416,686
Number of years for increase of authorized shares			10 years
Number of additional shares authorized yearly increase (as a percent)			5.00%
Common stock available for future grant (in shares)									586,522
Total common shares reserved for future issuance (in shares)												445,286
Inducement Plan
Subsidiary, Sale of Stock [Line Items]
Common stock available for future grant (in shares)									260,000
Total common shares reserved for future issuance (in shares)		200,000							280,000		540,000
Vesting period		4 years
Inducement Plan | Share-based Payment Arrangement, Tranche One
Subsidiary, Sale of Stock [Line Items]
Award vesting percentage		25.00%
Inducement Plan | Share-based Payment Arrangement, Tranche Two
Subsidiary, Sale of Stock [Line Items]
Vesting period for remaining vesting rights		36 months
Employee Stock Purchase Plan Two Thousand Twelve | 2022 Employee Stock Purchase Plan
Subsidiary, Sale of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, discount from market price, purchase date				15.00%
Share-based compensation arrangement by share-based payment award, purchase price of common stock, percent				85.00%
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)									159,635