Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 231	$ 180
Series A Convertible Preferred Stock, par value	$ 0.001	$ 0.001
Series A Convertible Preferred Stock, shares outstanding	22,386	22,387
Series B Convertible Preferred Stock, par value	$ 0.001	$ 0.001
Series B Convertible Preferred Stock, shares authorized	10,000,000	10,000,000
Series B Convertible Preferred Stock, shares outstanding	5,610,121	5,610,121
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	74,647,329	74,618,240
Treasury stock, shares	4,015	4,015