Common Stock - Additional Information (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) vote shares	Dec. 31, 2019 shares
Equity [Abstract]
Common stock shares outstanding	24,495,525	21,833,037
Shares subject to repurchase as a result of early exercise of stock options not yet vested	11,097	51,098
Number of votes for each share of common stock	The holders of common stock have one vote for each share of common stock held by them
Number of votes per share | vote	1
Dividends declared | $	$ 0