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Long‑Term Debt - Narrative (Details) | 1 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) installment | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |
Outstanding balance | $ 17,449,000 | $ 17,471,000
2014 Pacific Western Bank, Term and Revolving Loans |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | 25,000,000.0 |
Outstanding balance | 17,200,000 | 17,200,000
Term Loan | 2014 Pacific Western Bank, Term and Revolving Loans |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 15,000,000.0 |
Number of monthly installments | installment | 36 |
Outstanding balance | $ 13,500,000 | 13,500,000
Revolving Credit Facility | Line of Credit | 2014 Pacific Western Bank, Term and Revolving Loans |  |
Debt Instrument [Line Items] |  |
Outstanding balance | 3,700,000 | $ 3,700,000
Borrowing Capacity less Unpaid Principal Amount | Revolving Credit Facility | Line of Credit | 2014 Pacific Western Bank, Term and Revolving Loans |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | $ 25,000,000.0 |
Borrowing Capacity as a Percentage of Accounts Receivable | Revolving Credit Facility | Line of Credit | 2014 Pacific Western Bank, Term and Revolving Loans |  |
Debt Instrument [Line Items] |  |
Borrowing base as a percentage of eligible accounts receivable | 85.00% |
Borrowing base, basis spread, amount | $ 5,500,000.0 |
Borrowing base, basis spread, percentage of eligible inventory | 35.00% |
Prime Rate | Term Loan | 2014 Pacific Western Bank, Term and Revolving Loans |  |
Debt Instrument [Line Items] |  |
Basis on variable rate | 0.50% |
Variable rate floor | 5.00% |

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