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Stockholders' Equity - Summary of RSU Activity (Details) - USD ($)		3 Months Ended
	Jan. 09, 2014	Mar. 31, 2021
2013 Equity Incentive Plan
Restricted Stock Units information
Period for unrecognized compensation expense related to unvested options yet has not been recognized		2 years 3 months 18 days
2013 Equity Incentive Plan | Upon first anniversary of start date
Restricted Stock Units information
Percent of shares subject to option grant that will vest	25.00%
RSU
Restricted Stock Units information
Vesting period		4 years
RSU | 2013 Equity Incentive Plan
NUMBER OF SHARES
Unvested at beginning of period		192,533
Granted		413,113
Forfeited		(34,500)
Unvested at end of period		571,146
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE
Unvested at beginning of period		$ 4.53
Granted		3.82
Forfeited		3.81
Unvested at end of period		$ 4.06
RSU | 2013 Equity Incentive Plan | Non-executive employees
Restricted Stock Units information
Unrecognized compensation expense related to unvested service RSUs		$ 1,679,177
Period for unrecognized compensation expense related to unvested options yet has not been recognized		2 years 3 months 18 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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