Stockholders' Equity - Stock Options, Activity (Detail) - $ / shares	9 Months Ended
Sep. 30, 2023
Number of Option Shares
Outstanding, Beginning	4,450,283
Granted	1,562,000
Forfeited	(318,075)
Expired	(234,876)
Exercised	(143,789)
Outstanding, Ending	5,315,543
Options exercisable	2,607,790
Options unvested	2,707,753
Weighted Average Exercise Price
Outstanding, Beginning	$ 3.26
Granted	2.62
Forfeited	1.77
Expired	3.23
Exercised	0.51
Outstanding, Ending	3.24
Options exercisable	4.32
Options unvested	$ 2.2

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.