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Stockholders' Equity - Summary of Recognized Share-based Compensation Cost (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation (Income) expense | $ 70,000 | $ 116,000 | $ 203,000 | $ (5,000)
Selling, General and Administrative [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation (Income) expense | 54,000 | $ 116,000 | 160,000 | 58,000
Research and Development [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation (Income) expense | $ 16,000 |  | $ 43,000 | $ (63,000)

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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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