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Debt (Narrative) (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 14, 2017 | Jun. 29, 2016 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Credit facility borrowing base |  | $ 20.0 |
Senior Tranche |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, commitment fee |  | 1.50% |
Maximum borrowing capacity under loan agreement |  | $ 50.0 |
Subordinated Tranche |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, commitment fee |  | 2.30% |
Maximum borrowing capacity under loan agreement |  | $ 15.0 |
Additional Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility borrowing base |  | 5.0 |
Borrowings | $ 4.2 |  |
Commitment fee percentage |  |  | 2.30%
Commitment fees, amount |  |  | $ 5.0
Additional Term Loan [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate spread | 5.75% |  |
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Loans Payable |  | $ 15.0 |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate spread |  | 5.75% |

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- Definition Amount of commitment fees for the unused borrowing capacity under the long-term financing arrangement that is available to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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