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Restructuring - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Jun. 30, 2019 position | Mar. 31, 2019 position | Sep. 30, 2018 USD ($) | Jun. 30, 2019 position | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated | position |  | 9 | 3 |  | 12 |  |  |  |
Restructuring | $ (19) |  |  | $ 1 |  | $ 243 | $ (46) |  |
Cash and cash equivalents | 634 |  |  | 7,054 |  | 634 | 7,054 | $ 6,335 | $ 10,761
Restricted cash held | 342 |  |  | $ 342 |  | 342 | $ 342 |  |
Short-term debt | 3,000 |  |  |  |  | 3,000 |  |  |
Credit line borrowings | 1,323 |  |  |  |  | 1,323 |  | $ 2,219 |
Proceeds from issuance of subordinated convertible promissory notes |  |  |  |  |  | 1,700 |  |  |
Severance and Related Benefits |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  | 200 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Credit line borrowings | $ 1,300 |  |  |  |  | $ 1,300 |  |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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