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Stockholders' Equity - Summary of Recognized Share-based Compensation Cost (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation (Income) expense | $ 75,000 | $ (140,000) | $ 133,000 | $ (121,000)
Selling, General and Administrative [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation (Income) expense | 58,000 | (71,000) | 106,000 | (58,000)
Research and Development [Member] |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation (Income) expense | $ 17,000 | $ (69,000) | $ 27,000 | $ (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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- Details
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- Details
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