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Stockholders' Equity - Incentive Plans (Details) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2020 shares | Jan. 09, 2014 installment shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) shares | Dec. 31, 2019
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 | $ |  |  |  |  | $ 468,458 | $ 129,250 |
Cash proceeds from exercise of stock options | $ |  |  |  |  | $ 135,583 | 12,320 |
Options exercised | shares |  |  |  |  | 121,056 |  |
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 | $ |  |  | $ 12,644,390 |  | $ 12,644,390 |  |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  |  |  |  | 2 years 6 months |  |
Intrinsic value of options exercised | $ |  |  |  |  |  | 97,429 |
Cash proceeds from exercise of stock options | $ |  |  |  |  |  | 94,001 |
Options exercised | shares |  |  |  |  | 0 |  |
Fair value of shares vested | $ |  |  |  |  | $ 5,014,602 | $ 4,395,888 |
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 | shares |  |  | 5,010 | 13,021 | 121,056 | 32,439 |
Common Stock | 2013 Equity Incentive Plan |  |  |  |  |  |  |
Authorized shares |  |  |  |  |  |  |
Common stock authorized under 2013 plan | shares | 6,466,823 | 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% |  |  |  |  | 3.00%
Maximum number of shares that may be issued pursuant to exercise of incentive stock | shares |  | 20,000,000 |  |  |  |  |
Increase in number of shares of common stock | shares | 1,304,007 |  |  |  |  |  |

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