Capital Stock - Additional Information (Details) - USD ($)					12 Months Ended
	Dec. 10, 2020	Dec. 06, 2020	Oct. 21, 2020	Oct. 20, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 21, 2018
Class of Stock [Line Items]
Payments of stock issuance costs					$ 602,000
Warrant term		2 years	2 years
Exercise price (in dollars per share)					$ 4.85	$ 0.01	$ 0
Issuance of shares for professional service fees					$ 58,000
Term of agreement	6 months
Stock repurchased (in shares)					7,998	47,918
Tax obligations relating to the vesting of shares					$ 16,000	$ 0
Authorized repurchase amount (up to)								$ 750,000
Remaining authorized repurchase amount					673,000
Stock awards
Class of Stock [Line Items]
Tax obligations relating to the vesting of shares					16,000	$ 51,000
General and administrative
Class of Stock [Line Items]
Professional service fees					$ 58,000
Private Placement
Class of Stock [Line Items]
Sale of stock, consideration received per transaction		$ 4,654,000	$ 2,717,000
Payments of stock issuance costs		$ 346,000	$ 256,000
Exercise price (in dollars per share)			$ 4.08
Warrants
Class of Stock [Line Items]
Exercise price (in dollars per share)		$ 5.49
Fair value of SVB Warrant		$ 2,635,000	$ 1,334,000
Warrants | Private Placement
Class of Stock [Line Items]
Number of shares sold in transaction (in shares)		625,000	521,500
Common Stock
Class of Stock [Line Items]
Issuance of common shares from warrant exercise (in shares)				72,238	72,000
Issuance of shares for professional service fees (in shares)	50,000				50,000
Issuance of shares for professional service fees	$ 348,000
Conversion of convertible preferred stock, shares (in shares)					158,333	43,919
Issuances related to Stock Compensation					30,834	109,183
Issuance of restricted stock (in shares)					23,000	109,000
Forfeiture of RSA (in shares)					9,321	0
Common Stock | Private Placement
Class of Stock [Line Items]
Number of shares sold in transaction (in shares)		1,250,000	1,043,000
Sale of stock, price per share (in dollars per share)		$ 4.00	$ 2.85
Proceeds from issuance or sale of equity		$ 5,000,000	$ 2,973,000
Treasury Stock
Class of Stock [Line Items]
Issuance of restricted stock (in shares)					8,000	(76,000)