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v3.19.1

Stockholders' Equity - Equity Plan (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) offering_period shares | Dec. 31, 2017 shares | Jun. 30, 2018 shares | Jan. 01, 2013 shares
ESPP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Offering Periods, Employee Stock Purchase Plan | offering_period | 2 |  |  |
Offering Periods, Employee Stock Purchase Plan, Term | 6 months |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 15.00% |  |
ESPP annual cap | $ | $ 25,000 |  |  |
percentage of stock closing price | 85.00% |  |  |
percentage of ESPP closing price | 85.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  | 100,000 | 500,000 | 50,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 26,875 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 405,655 |  |  |
2018 Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  | 1,500,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,054,411 |  |  |

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- Definition Number of Offering Periods, Employee Stock Purchase Plan + References No definition available. + Details
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- Definition Offering Periods, Employee Stock Purchase Plan, Term + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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