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Commitments and Contingencies - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) facility | Jun. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Number of leased facilities | facility |  |  | 2 |
Rent expense | $ | $ 73 | $ 74 | $ 148 | $ 147

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- Definition Operating Leases, Number of Facilities + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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