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Stockholders' Equity - Incentive Plans (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jan. 09, 2014 installment shares | May 31, 2022 shares | Mar. 31, 2021 shares | Jun. 30, 2022 USD ($) shares | Jun. 30, 2021 USD ($) shares
Maximum |  |  |  |  |
Incentive plans |  |  |  |  |
Expiration period |  |  |  | 10 years |
2003 Stock Incentive Plan |  |  |  |  |
Incentive plans |  |  |  |  |
Period from date of termination that any vested options shall expire |  |  |  | 60 days |
Expiration period |  |  |  | 10 years |
Intrinsic value of options exercised | $ |  |  |  |  | $ 8,668
Cash proceeds from exercise of stock options | $ |  |  |  |  | $ 4,239
Shares issued from exercise of stock options |  |  |  | 0 | 3,785
2003 Stock Incentive Plan | Upon first anniversary of start date |  |  |  |  |
Incentive plans |  |  |  |  |
Percent of shares subject to option grant that will vest |  |  |  | 25.00% |
2003 Stock Incentive Plan | Each month after the first anniversary |  |  |  |  |
Incentive plans |  |  |  |  |
Percent of shares subject to option grant that will vest |  |  |  | 2.083% |
2013 Equity Incentive Plan |  |  |  |  |
Incentive plans |  |  |  |  |
Period from date of termination that any vested options shall expire | 90 days |  |  |  |
Expiration period | 10 years |  |  |  |
Unrecognized compensation expense related to unvested options | $ |  |  |  | $ 4,197,865 |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  |  |  | 2 years 1 month 6 days |
Shares issued from exercise of stock options |  |  |  | 0 | 0
Fair value of shares vested | $ |  |  |  | $ 2,060,622 | $ 3,745,954
Authorized shares |  |  |  |  |
Common stock authorized | 1,000,000 |  |  | 9,506,767 |
Shares available for future grants |  |  |  | 1,469,324 |
Maximum number of shares that may be issued pursuant to exercise of incentive stock |  |  |  | 20,000,000 |
Increase in number of shares of common stock |  | 2,619,622 |  |  |
Maximum percentage of shares of common stock issued and outstanding on the immediately preceding fiscal year, or such lesser number of shares as determined by the board of directors or the compensation committee |  |  |  | 4.00% |
2013 Equity Incentive Plan | Upon first anniversary of start date |  |  |  |  |
Incentive plans |  |  |  |  |
Percent of shares subject to option grant that will vest | 25.00% |  |  |  |
Number of monthly installments | installment | 36 |  |  |  |
Common Stock |  |  |  |  |
Incentive plans |  |  |  |  |
Shares issued from exercise of stock options |  |  | 3,785 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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