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Stock-based Compensation - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | May 31, 2015
Stock-based compensation |  |  |  |  |  |  |
Shares of common stock authorized for issuance outstanding (in shares) |  | 4,190,116 |  | 4,190,116 |  | 3,585,856 |
Employee Stock Purchase Plan, Purchase Price Percentage |  |  |  | 85.00% |  |  |
Issuance for employee stock purchase plan, shares |  |  |  | 32,826 |  |  |
Proceeds from issuances of common stock from employee stock purchase plans |  |  |  | $ 444,000 | $ 510,000 |  |
Employee Stock Purchase Plan, Compensation Expense |  | $ 73,000 | $ 120,000 | 173,000 | 242,000 |  |
Share-based Compensation |  |  |  | $ 8,425,000 | $ 6,254,000 |  |
Maximum |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Period following termination date vested options are exercisable |  |  |  | 3 months |  |  |
Performance share units |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |
Share-based Compensation |  | 27,000 |  | $ 42,000 |  |  |
Restricted Stock Awards And Restricted Stock Units |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Unrecognized compensation cost related to outstanding options |  | $ 34,447 |  | $ 34,447 |  |  |
Period over which unrecognized compensation cost is expected to be recognized as expense |  |  |  | 2 years 8 months 12 days |  |  |
2014 Stock Incentive Plan |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Shares of common stock authorized for issuance (in shares) |  |  |  |  |  |  | 2,700,000
Shares of common stock remaining available for future grant |  | 1,261,162 |  | 1,261,162 |  |  |
Increase in number of authorized shares on the first day of each fiscal year, as a percentage of outstanding common stock (as a percent) |  |  |  | 4.00% |  |  |
Vesting period |  |  |  | 4 years |  |  |
Contractual life |  |  |  | 10 years |  |  |
2014 Stock Incentive Plan | Minimum |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |
Period following termination date vested options are exercisable |  |  |  | 1 year |  |  |

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- Definition Represents the additional shares that may be authorized for issuance annually under an established share-based compensation plan, expressed as a percentage of the entity's outstanding shares. + References No definition available. + Details
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- Definition Period after the date the vested equity-based award expires during which an employee continues to have the right to exercise an award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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=116856206&loc=d3e5070-113901 + Details
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