Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 3	$ 2
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	55,155,755	54,259,390
Common stock, shares outstanding	55,155,755	54,259,390