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Stockholders' Equity - Stock Options, Activity (Detail)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Number of Option Shares
Outstanding, Beginning | shares	2,171,477
Granted | shares	1,363,875
Forfeited | shares	(331,824)
Expired | shares	(1,151)
Outstanding, Ending | shares	3,202,377
Options exercisable | shares	1,393,630
Options unvested | shares	1,808,747
Weighted Average Exercise Price
Outstanding, Beginning | $ / shares	$ 5.62
Granted | $ / shares	3.02
Forfeited | $ / shares	4.57
Expired | $ / shares	10.00
Outstanding, Ending | $ / shares	4.62
Options exercisable | $ / shares	5.12
Options unvested | $ / shares	$ 4.24

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- 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.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB
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-Topic 718
-SubTopic 10
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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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- Definition

Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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