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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation |
Schedule of stock-based compensation |
|  | For the Years Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Cost of revenue |  | $ | 256,924 |  | $ | 279,221 |  | $ | 214,325
General and administrative |  |  | 1,167,161 |  |  | 1,000,002 |  |  | 1,670,015
Sales and marketing |  |  | 348,603 |  |  | 329,644 |  |  | 441,931
Research and development |  |  | 82,277 |  |  | 155,452 |  |  | 128,092
Total stock-based compensation expense |  | $ | 1,854,965 |  | $ | 1,764,319 |  | $ | 2,454,363
Summary of stock option activity |
|  |  |  |  |  |  | Weighted-Average |  |  |
|  |  |  | Weighted-Average |  | Remaining |  | Aggregate
|  |  |  | Exercise Price |  | Contractual |  | Intrinsic
|  | Options |  | Per Share |  | Life (Yrs.) |  | Value
Outstanding beginning of period |  | 1,129,463 |  | $ | 2.29 |  | 4.2 |  | $ | 25,052,908
Options granted |  | 50,000 |  |  | 21.13 |  |  |  |  |
Options exercised |  | (539,853) |  |  | 1.60 |  |  |  |  |
Options cancelled |  | (750) |  |  | 26.33 |  |  |  |  |
Options expired |  | — |  |  | — |  |  |  |  |
Outstanding end of period |  | 638,860 |  | $ | 4.31 |  | 4.3 |  | $ | 12,192,995
Exercisable |  | 586,985 |  | $ | 2.84 |  | 3.9 |  | $ | 12,067,647
Schedule of weighted average assumptions were used to estimate the fair value of stock option grants using Black-Scholes model |
|  | For the Years Ended December 31, |
|  | 2019 |  | 2018 |  | 2017 |
Volatility |  | 59.1 | % | — | % | 92.0 | %
Expected term (years) |  | 6.3 |  | — |  | 6.3 |
Risk-free interest rate |  | 1.5 | % | — | % | 1.4 | %
Dividend yield |  | 0.0 | % | — | % | 0.0 | %
Summary of restricted stock unit activity |
|  | Restricted |  | Weighted-Average
|  | Stock |  | Grant Date
|  | Units |  | Fair Value
Unvested at December 31, 2018 |  | 226,501 |  | $ | 15.89
Granted |  | 178,657 |  | $ | 21.88
Vested |  | (93,989) |  | $ | 16.41
Cancelled |  | (14,121) |  | $ | 15.11
Unvested at December 31, 2019 |  | 297,048 |  | $ | 19.36

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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