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Stock-Based Compensation - Summary of Options Outstanding and Vested Pricing of Exercise Prices (Detail) - Employee Stock Option	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	4,996,284
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years 8 months 12 days
Options Outstanding, Number Exercisable	4,345,497
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years 1 month 6 days
$0.4213
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 0.4213
Options Outstanding, Number Outstanding	512,036
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	3 years 10 months 24 days
Options Outstanding, Number Exercisable	512,036
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	3 years 10 months 24 days
$0.78
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 0.78
Options Outstanding, Number Outstanding	49,549
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	2 years 7 months 6 days
Options Outstanding, Number Exercisable	49,549
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	2 years 7 months 6 days
$1.7554
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 1.7554
Options Outstanding, Number Outstanding	288,404
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years
Options Outstanding, Number Exercisable	288,404
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years
$1.9984
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 1.9984
Options Outstanding, Number Outstanding	262,120
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years 1 month 6 days
Options Outstanding, Number Exercisable	262,120
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years 1 month 6 days
$2.18
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 2.18
Options Outstanding, Number Outstanding	1,842
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	5 years 6 months
Options Outstanding, Number Exercisable	1,842
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	5 years 6 months
$2.87
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 2.87
Options Outstanding, Number Outstanding	982
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	5 years 8 months 12 days
Options Outstanding, Number Exercisable	880
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	6 years 4 months 24 days
$3.07
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 3.07
Options Outstanding, Number Outstanding	600,000
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	7 years 8 months 12 days
Options Outstanding, Number Exercisable	349,998
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	7 years 8 months 12 days
$3.4 to $3.98
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding, Number Outstanding	1,163,543
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	3 years
Options Outstanding, Number Exercisable	1,163,543
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	3 years
$3.4 to $3.98 | Minimum
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 3.4
$3.4 to $3.98 | Maximum
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	3.98
$4.54
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 4.54
Options Outstanding, Number Outstanding	255,806
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	3 months 18 days
Options Outstanding, Number Exercisable	255,806
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	3 months 18 days
$6.21
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 6.21
Options Outstanding, Number Outstanding	400,000
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	9 years 4 months 24 days
Options Outstanding, Number Exercisable	0
$8.19
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 8.19
Options Outstanding, Number Outstanding	6,552
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	5 years 8 months 12 days
Options Outstanding, Number Exercisable	5,869
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	5 years 8 months 12 days
$25.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices | $ / shares	$ 25.00
Options Outstanding, Number Outstanding	1,455,450
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years 7 months 6 days
Options Outstanding, Number Exercisable	1,455,450
Options Outstanding, Weighted- Average Remaining Contractual Life (in years)	4 years 7 months 6 days

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

+ References

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-Publisher FASB
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-Topic 718
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-Section 50
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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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