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Stockholders' Equity - Summary of RSU Activity (Details) - 2013 Equity Incentive Plan - USD ($) |  | 3 Months Ended
--- | --- | ---
Jan. 09, 2014 | Mar. 31, 2022
Restricted Stock Units information |  |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 2 years 3 months 18 days
Upon first anniversary of start date |  |
Restricted Stock Units information |  |
Vesting percentage | 25.00% |
RSU |  |
NUMBER OF SHARES |  |
Unvested at beginning of period |  | 345,600
Vested |  | (78,550)
Unvested at end of period |  | 267,050
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE |  |
Unvested at beginning of period |  | $ 3.70
Vested |  | 3.81
Unvested at end of period |  | $ 3.66
RSU | Non-executive employees |  |
Restricted Stock Units information |  |
Vesting period |  | 4 years
Unrecognized compensation expense related to unvested service RSUs |  | $ 849,932
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 2 years 9 months 18 days

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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