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Stockholders' Equity - Incentive Plans (Details) |  | 3 Months Ended
--- | --- | ---
Jan. 09, 2014 installment shares | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) 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 | $ 459,098
Cash proceeds from exercise of stock options | $ |  | $ 4,239 | 129,972
Options exercised |  | 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 | $ |  | $ 9,254,305 |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 2 years 3 months 18 days |
Options exercised |  | 0 |
Fair value of shares vested | $ |  | $ 2,269,172 | $ 2,618,307
2013 Equity Incentive Plan | Upon first anniversary of start date |  |  |
Incentive plans |  |  |
Percent of shares subject to option grant that will vest | 25.00% |  |
2013 Equity Incentive Plan | Each month after the first anniversary |  |  |
Incentive plans |  |  |
Number of monthly installments | installment | 36 |  |
Common Stock |  |  |
Incentive plans |  |  |
Options exercised |  | 3,785 | 116,046
Common Stock | 2013 Equity Incentive Plan |  |  |
Authorized shares |  |  |
Common stock authorized | 1,000,000 |  |
Automatic increase in number of shares reserved for issuance as a percentage of the total common stock outstanding at the end of the prior year | 3.00% |  |
Maximum number of shares that may be issued pursuant to exercise of incentive stock | 20,000,000 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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