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Debt - Additional Information (Details) - December Two Thousand Fifteen Facility - Revolving Credit Facility - Secured Debt - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2015 | Jul. 31, 2017
Debt Instrument [Line Items] |  |
Line of credit facility, maximum borrowing capacity | $ 40,000,000 |
Debt instrument, description of variable rate basis |  | The December 2015 Facility is denominated in U.S. dollars and, depending on certain conditions, each borrowing is subject to a floating interest rate equal to either the prime rate plus a spread of 0.25% to 2.75% or a reserve adjusted LIBOR rate (based on one, three or six-month interest periods) plus a spread of 1.25% to 3.75%.
Line of credit facility, commitment fee percentage | 0.20% |
Line of credit facility, amount drawn | $ 40,000,000 |
Line of credit facility, interest rate | 1.82% |
Line of credit facility maturity date |  | Dec. 31, 2018
London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Line of credit facility, floating interest rate | 1.25% |
Minimum |  |
Debt Instrument [Line Items] |  |
Minimum deposit held as collateral for line of credit | $ 0 |
Minimum deposit amount with lender | $ 40,000,000 |
Minimum | Prime Rate |  |
Debt Instrument [Line Items] |  |
Line of credit facility, floating interest rate | 0.25% |
Minimum | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Line of credit facility, floating interest rate | 1.25% |
Maximum | Prime Rate |  |
Debt Instrument [Line Items] |  |
Line of credit facility, floating interest rate | 2.75% |
Maximum | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Line of credit facility, floating interest rate | 3.75% |

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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