Subsequent Events (Details) - Revolving credit facility - USD ($)
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12 Months Ended |
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Feb. 06, 2018 |
Dec. 31, 2016 |
Feb. 05, 2018 |
| Subsequent Event [Line Items] |
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| Commitment fee for quarterly unused capacity (as a percent) |
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0.25%
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| Unused line of credit fee threshold |
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$ 15,000,000
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| Prime Rate |
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| Subsequent Event [Line Items] |
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| Variable interest rate basis |
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Prime Rate
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| Prime Rate | Minimum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
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0.00%
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| Prime Rate | Maximum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
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0.25%
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| LIBOR |
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| Subsequent Event [Line Items] |
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| Variable interest rate basis |
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LIBOR
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| LIBOR | Minimum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
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2.50%
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| LIBOR | Maximum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
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2.75%
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| 2016 Loan Agreement |
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| Subsequent Event [Line Items] |
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| Maximum borrowing capacity |
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$ 30,000,000
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| Subsequent events | 2016 Loan Agreement |
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| Subsequent Event [Line Items] |
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| Maximum borrowing capacity |
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$ 30,000,000
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| Subsequent events | 2018 Loan Amendment |
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| Subsequent Event [Line Items] |
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| Maximum borrowing capacity |
$ 40,000,000
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| Commitment fee |
$ 100,000
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| Commitment fee for quarterly unused capacity (as a percent) |
0.25%
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| Unused line of credit fee threshold |
$ 15,000,000
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| Subsequent events | 2018 Loan Amendment | Prime Rate |
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| Subsequent Event [Line Items] |
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| Variable interest rate basis |
Prime Rate
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| Subsequent events | 2018 Loan Amendment | Prime Rate | Minimum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.00%
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| Subsequent events | 2018 Loan Amendment | Prime Rate | Maximum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
0.25%
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| Subsequent events | 2018 Loan Amendment | LIBOR |
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| Subsequent Event [Line Items] |
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| Variable interest rate basis |
LIBOR Rate
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| Subsequent events | 2018 Loan Amendment | LIBOR | Minimum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
2.50%
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| Subsequent events | 2018 Loan Amendment | LIBOR | Maximum |
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| Subsequent Event [Line Items] |
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| Basis spread on variable rate (as a percent) |
2.75%
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