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v3.19.1

Stockholders' Equity (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Jan. 01, 2013
Class of Stock [Line Items] |  |  |  |  |
Common Stock Warrants, Shares |  |  | 209,818 |  |
Aspire Capital Purchase Agreement [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares, Issued |  |  | 319,776 |  |
Term Of Agreement In Months | 24 months |  |  |  |
Minimum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 1 year |  |  |
ESPP [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares authorized under the plan |  |  | 100,000 | 500,000 | 50,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 26,875 |  |  |
Shares, Outstanding |  | 405,655 |  |  |
Share-based Compensation Award, Tranche One [Member] | Stock Options [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 2 years |  |  |
Share-based Compensation Award, Tranche Two [Member] | Stock Options [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 3 years |  |  |
Share-based Compensation Award, Tranche Three [Member] | Stock Options [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |
Restricted Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
weighted average estimated fair value of restricted stock |  | $ 3.79 | $ 3.45 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross |  | 91,740 | 181,908 |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross |  | $ 347,700 | $ 627,700 |  |
Restricted Stock [Member] | Maximum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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