Condensed Consolidated balance sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.000001	$ 0.000001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	41,876,590	37,996,849
Common stock, shares outstanding	41,876,590	37,996,849
Preferred stock, par value	$ 0.000001	$ 0.000001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0