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Stockholders' Equity - Warrants (Details) - $ / shares |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 29, 2019
Class of Warrant or Right [Line Items] |  |  |  |
Warrant exercise price (in dollars per share) |  |  |  | $ 3.47
Warrants |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants received, as a percentage of common shares purchased |  | 25.00% |  |
Warrants outstanding, beginning |  | 5,210,698 | 5,253,318 |
Warrants granted |  | 288,184 | 0 |
Warrants exercised |  | (93,213) | (42,620) |
Warrants outstanding, ending | 5,253,318 | 5,405,669 | 5,210,698 |
Warrant exercise price (in dollars per share) | $ 8.28 | $ 8.20 | $ 8.32 |
Warrant exercise price, grants during the period (in dollars per share) |  | 3.47 | 0.00 |
Warrant exercise price, exercised during the period (in dollars per share) |  | $ 0.00 | $ 4.25 |
Warrants outstanding, remaining contractual life | 3 years 10 months 21 days | 2 years 4 months 24 days | 3 years 1 month 6 days |
Warrants granted, remaining contractual life |  | 9 years 3 months |  |

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- Definition The percentage of common shares purchased that investors received in warrants or rights. + References No definition available. + Details
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- Definition The number of warrants or rights exercised during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of warrants that were exercised during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of warrants that were granted during the period. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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