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Stock-Based Compensation - Stock Options and Restricted Stock Units Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock Options |  |  |
Stock Options |  |  |
Outstanding beginning of period (in shares) | 1,129,463 |  |
Options granted (in shares) | 50,000 | 0 |
Options exercised (in shares) | (539,853) |  |
Options cancelled (in shares) | (750) |  |
Outstanding end of period (in shares) | 638,860 | 1,129,463 |
Exercisable (in shares) | 586,985 |  |
Weighted-Average Exercise Price Per Share |  |  |
Outstanding beginning of period (in dollars per share) | $ 2.29 |  |
Options granted (in dollars per share) | 21.13 |  |
Options exercised (in dollars per share) | 1.60 |  |
Options cancelled (in dollars per share) | 26.33 |  |
Outstanding end of period (in dollars per share) | 4.31 | $ 2.29 |
Exercisable (in dollars per share) | $ 2.84 |  |
Weighted-Average Remaining Contractual Life (Yrs.) |  |  |
Weighted-Average Remaining Contractual Life, Outstanding (in years) | 4 years 3 months 18 days | 4 years 2 months 12 days |
Weighted-Average Remaining Contractual Life, Exercisable (in years) | 3 years 10 months 24 days |  |
Aggregate Intrinsic Value |  |  |
Outstanding beginning of period (in dollars) | $ 25,052,908 |  |
Outstanding end of period (in dollars) | 12,192,995 | $ 25,052,908 |
Exercisable (in dollars) | 12,067,647 |  |
Total unrecognized compensation expense | $ 538,991 |  |
Weighted-average period expected to be recognized | 3 years 7 months 6 days |  |
Total grant date fair value of stock options vested during the period | $ 101,387 |  |
Total intrinsic value of options exercised | $ 11,870,492 | $ 6,071,319 | $ 268,053
Weighted-average grant-date fair value of options granted (in dollars per share) | $ 11.84 |  | $ 11.10
Summary of weighted average assumptions used to estimate the fair value of stock option grants |  |  |
Volatility (as a percent) | 59.10% |  | 92.00%
Expected term (years) | 6 years 3 months 18 days | 0 years | 6 years 3 months 18 days
Risk- free interest rate (as a percent) | 1.50% |  | 1.40%
Dividend yield (as a percent) | 0.00% |  | 0.00%
Restricted Stock Units |  |  |
Aggregate Intrinsic Value |  |  |
Weighted-average period expected to be recognized | 3 years 1 month 6 days |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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