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Stock-Based Compensation - Summary of Significant Ranges of Outstanding and Exercisable Options (Details) - Options Outstanding to Purchase Common Stock $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
$1.57 - $14.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit (in dollars per share)	$ 1.57
Upper range limit (in dollars per share)	$ 14.99
Number Outstanding (in shares) | shares	143
Weighted Average Remaining Contractual Life (in Years)	7 years 6 months 3 days
Weighted Average Exercise Price (in dollars per share)	$ 2.62
Number Exercisable (in shares) | shares | shares	101
Weighted Average Exercise Price (in dollars per share)	$ 2.80
Options Outstanding, Aggregate Intrinsic Value | $	$ 219
$15.00 - $25.59
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit (in dollars per share)	$ 15.00
Upper range limit (in dollars per share)	$ 25.59
Number Outstanding (in shares) | shares	8
Weighted Average Remaining Contractual Life (in Years)	1 year 11 months 26 days
Weighted Average Exercise Price (in dollars per share)	$ 15.00
Number Exercisable (in shares) | shares | shares	8
Weighted Average Exercise Price (in dollars per share)	$ 15.00
$25.60 - $143.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit (in dollars per share)	25.60
Upper range limit (in dollars per share)	$ 143.99
Number Outstanding (in shares) | shares	2
Weighted Average Remaining Contractual Life (in Years)	2 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 41.81
Number Exercisable (in shares) | shares | shares	2
Weighted Average Exercise Price (in dollars per share)	$ 41.81
$144.00 - $409.99
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit (in dollars per share)	144.00
Upper range limit (in dollars per share)	$ 409.99
Number Outstanding (in shares) | shares	5
Weighted Average Remaining Contractual Life (in Years)	4 years 10 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 144.00
Number Exercisable (in shares) | shares | shares	5
Weighted Average Exercise Price (in dollars per share)	$ 144.00
$410.00 - $924.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit (in dollars per share)	410.0
Upper range limit (in dollars per share)	$ 924.00
Number Outstanding (in shares) | shares	1
Weighted Average Remaining Contractual Life (in Years)	3 years 5 months 8 days
Weighted Average Exercise Price (in dollars per share)	$ 430.64
Number Exercisable (in shares) | shares | shares	1
Weighted Average Exercise Price (in dollars per share)	$ 430.64
$1.57 - $924.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit (in dollars per share)	1.57
Upper range limit (in dollars per share)	$ 924.00
Number Outstanding (in shares) | shares	159
Weighted Average Remaining Contractual Life (in Years)	7 years 18 days
Weighted Average Exercise Price (in dollars per share)	$ 10.82
Number Exercisable (in shares) | shares | shares	117
Weighted Average Exercise Price (in dollars per share)	$ 13.91
Options Outstanding, Aggregate Intrinsic Value | $	$ 219

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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