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Debt and Financing Arrangements - Narrative (Details) - USD ($) |  |  | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2017 | Jun. 17, 2015 | Apr. 30, 2017 | Nov. 21, 2018 | Nov. 21, 2017 | Jan. 31, 2017 | Nov. 21, 2016 | May 31, 2015 | Mar. 10, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  | $ 5,400,000 |  |  |
Loan and Security Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  | $ 5,400,000.0 |  |  |  |  |  |
Shares issuable under warrants granted (in shares) |  |  |  |  |  |  |  |  | 187,500
Per share value, shares issuable under warrants granted (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.40
Additional shares issuable under warrants granted (in shares) |  |  |  |  |  |  |  |  | 112,500
Warrants exercised during period, shares issued (in shares) | 168,750 |  |  |  |  |  |  |  |
Warrants exercised, shares withheld in lieu of cash (in shares) | 18,750 |  |  |  |  |  |  |  |
Loan and Security Agreement | Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan face amount |  |  |  |  |  |  |  |  | $ 10,000,000.0
Loan and Security Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit maximum borrowing capacity |  | $ 20,000,000.0 |  |  |  |  | $ 40,000,000.0 |  | 5,000,000.0
Line of credit maturity extension |  | 1 year |  |  |  |  |  |  |
Draws on line of credit |  |  | $ 0 |  |  | 0 |  |  | $ 0
Unused line of credit percentage fee |  |  | 0.15% |  |  |  |  |  |
Line of credit commitment fee |  |  |  |  |  |  | $ 100,000 |  |
Loan and Security Agreement | Revolving Credit Facility | Line of Credit | Prime Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit interest rate |  |  | 0.75% |  |  |  |  |  |
Financing Agreement 2015 | Capital Lease |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan face amount |  |  |  |  |  |  |  | $ 900,000.0 |
Financing agreement, implicit interest rate |  |  |  |  |  |  |  | 5.00% |
Financing agreement outstanding |  |  | $ 300,000 |  |  | 400,000 |  |  |
Financing Agreement 2017 | Capital Lease |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan face amount |  |  |  |  |  | $ 400,000.0 |  |  |
Financing agreement, implicit interest rate |  |  |  |  |  | 4.50% |  |  |
Financing agreement outstanding |  |  | $ 300,000 |  |  | $ 400,000 |  |  |
Scenario, Forecast | Loan and Security Agreement | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit commitment fee |  |  |  | $ 100,000 | $ 100,000 |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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