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Stock Option Plan - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 31, 2019 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, unrecognized compensation cost | $ 6,400,000 |  | $ 6,400,000 |  |  |
Stock options, cost not yet recognized, remaining weighted average vesting period |  |  | 3 years 6 months |  |  |
Stock-based compensation expense | $ 62,000 | $ 10,000 | $ 85,000 | $ 100,000 |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for issuance under Stock Option Plan | 120,000 |  | 120,000 |  |  |
Annual percentage increase in shares available for issuance under the Plan | 100.00% |  | 100.00% |  |  |
Maximum Employee payroll deduction percentage | 2000.00% |  | 2000.00% |  |  |
Stock-based compensation expense | $ 0 |  | $ 0 |  |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options, expiration period |  |  | 10 years |  |  |
Stock options, vesting period |  |  | 4 years |  |  |
2013 Stock Option Plan | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for issuance under Stock Option Plan |  |  |  |  | 1,663,681 | 669,806
2019 Incentive Award Plan | Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for issuance under Stock Option Plan | 2,011,832 |  | 2,011,832 |  |  |
Annual percentage increase in shares available for issuance under the Plan | 400.00% |  | 400.00% |  |  |
Shares that remain available for future awards | 1,199,631 |  | 1,199,631 |  |  |

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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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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