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Stockholders' Equity - Share-Based Compensation - Additional Information (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock option compensation expense | $ 54,000 | $ 7,000
Restricted stock compensation expense | 4,000 | 14,000
Stock Options [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock option compensation expense | 54,000 | 7,000
Restricted Stock [Member] | Consultants [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock compensation expense | $ 4,000 |
Restricted Stock [Member] | Employees [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Restricted stock compensation expense |  | $ 14,000
2019 Equity Incentive Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares available for grant | 333,333 |
2019 Equity Incentive Plan [Member] | Maximum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of shares authorized for issuance | 1,500,000 |
2019 Equity Incentive Plan [Member] | Minimum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock options, exercise price of common stock granted as percentage of fair value on the date of grant | 100.00% |

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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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