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Debt - 2017 Facility - Additional Information (Details) - 2017 Credit Facility $ in Millions | May 04, 2017 USD ($) payment | Jun. 30, 2018 | Dec. 31, 2017 payment
--- | --- | --- | ---
Debt |  |  |
Loan agreement amount | $ | $ 12.0 |  |
Number of interest and principal payments |  |  | 24
End-of-term fee (as a percent) | 6.00% |  |
Minimum |  |  |
Debt |  |  |
Number of interest and principal payments | 24 |  |
Maximum |  |  |
Debt |  |  |
Number of interest and principal payments | 36 |  |
Prime Rate |  |  |
Debt |  |  |
Interest rate, negative basis spread percentage | 0.75% |  |
Interest rate |  | 4.25% |

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- Definition The percentage of the amount borrowed that must be paid when the loan is prepaid or repaid. + References No definition available. + Details
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- Definition Number of interest and principal payments. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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