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Stockholders' Equity - Summary of RSU Activity (Details) - 2013 Equity Incentive Plan - USD ($)	1 Months Ended		12 Months Ended
	Jan. 31, 2021	Sep. 30, 2019	Dec. 31, 2021
Restricted Stock Units information
Period for unrecognized compensation expense related to unvested options yet has not been recognized			2 years
Upon first anniversary of start date
Restricted Stock Units information
Vesting percentage			25.00%
RSU
NUMBER OF SHARES
Unvested at beginning of period	192,533		192,533
Granted			444,613
Forfeited			(101,754)
Vested			(189,792)
Unvested at end of period			345,600
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE
Unvested at beginning of period	$ 4.53		$ 4.53
Granted			3.72
Forfeited			3.84
Vested			4.53
Unvested at end of period			$ 3.70
RSU | Non-executive employees
Restricted Stock Units information
Vesting period	4 years	2 years
Unrecognized compensation expense related to unvested service RSUs			$ 943,458
Period for unrecognized compensation expense related to unvested options yet has not been recognized			3 years
NUMBER OF SHARES
Granted		332,106
RSU | Non-executive employees | Upon first anniversary of start date
Restricted Stock Units information
Vesting percentage		33.30%
RSU | Non-executive employees | On the second anniversary of the date of grant
Restricted Stock Units information
Vesting percentage		66.70%

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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