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Stock-based Compensation - Summary of Stock Options Outstanding (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Options Outstanding | 2,645,714 | 1,320,197
Options outstanding, weighted average remaining contractual life | 7 years 18 days | 7 years 11 months 23 days
Options exercisable | 1,058,169 | 665,255
Options exercisable, weighted average exercise price | $ 2.80 | $ 0.74
Exercise Price $0.45 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 0.45 | $ 0.45
Options Outstanding | 356,906 | 399,567
Options outstanding, weighted average remaining contractual life | 4 years 8 months 12 days | 6 years 6 months 3 days
Options exercisable | 286,322 | 288,402
Options exercisable, weighted average exercise price | $ 0.45 | $ 0.45
Exercise Price $0.75 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 0.75 | $ 0.75
Options Outstanding | 325,747 | 352,261
Options outstanding, weighted average remaining contractual life | 7 years 1 month 2 days | 8 years 1 month 6 days
Options exercisable | 255,364 | 192,290
Options exercisable, weighted average exercise price | $ 0.75 | $ 0.75
Exercise Price $0.90 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 0.90 | $ 0.90
Options Outstanding | 369,056 | 455,041
Options outstanding, weighted average remaining contractual life | 8 years 8 months 8 days | 9 years 8 months 8 days
Options exercisable | 219,743 | 82,924
Options exercisable, weighted average exercise price | $ 0.90 | $ 0.90
Exercise Price $1.35 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 1.35 | $ 1.35
Options Outstanding | 41,815 | 64,376
Options outstanding, weighted average remaining contractual life | 4 years 6 months 29 days | 5 years 8 months 1 day
Options exercisable | 45,148 | 63,962
Options exercisable, weighted average exercise price | $ 1.35 | $ 1.35
Exercise Price $1.50 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 1.50 | $ 1.50
Options Outstanding | 35,232 | 48,952
Options outstanding, weighted average remaining contractual life | 5 years 6 months 7 days | 6 years 6 months 7 days
Options exercisable | 38,565 | 37,677
Options exercisable, weighted average exercise price | $ 1.50 | $ 1.50
Exercise Price $2.26 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 2.26 |
Options Outstanding | 169,000 |
Options outstanding, weighted average remaining contractual life | 9 years 10 months 2 days |
Options exercisable, weighted average exercise price | $ 2.26 |
Exercise Price $2.48 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 2.48 |
Options Outstanding | 610,000 |
Options outstanding, weighted average remaining contractual life | 9 years 11 months 1 day |
Options exercisable, weighted average exercise price | $ 2.48 |
Exercise Price $3.87 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 3.87 |
Options Outstanding | 219,640 |
Options outstanding, weighted average remaining contractual life | 10 years |
Options exercisable, weighted average exercise price | $ 3.87 |
Exercise Price $10.94 |  |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |  |
Exercise price | $ 10.94 |
Options Outstanding | 518,318 |
Options outstanding, weighted average remaining contractual life | 9 years 3 months 7 days |
Options exercisable | 213,027 |
Options exercisable, weighted average exercise price | $ 10.94 |

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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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 (c)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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