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Line-of-Credit and Long-term Debt - Additional Information (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2013 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 13, 2014 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Interest rate swap, fixed rate |  | 4.11% |  |
Long-term debt |  | $ 69,959,000 |  |
Interest Rate Swap | Other Liabilities | Level 2 |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Notional Amount |  | $ 66,046,000 |  |
Interest rate swap, fixed rate |  | 4.11% |  |
Revolving line of credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total short-term and long-term debt |  | $ 0 | $ 7,700,000 |
Promissory Note |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Face amount | $ 4,750,000 |  |  |
Stated percentage | 4.25% |  |  |
Monthly principal and interest payments | $ 102,700 |  |  |
Long-term debt |  | $ 3,695,000 |  |
Term loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit amount |  |  |  | $ 70,000,000
Interest only payment period |  | 2 years |  |
Term loan | Selected LIBOR rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.17% |  |
Revolving line of credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit amount |  |  |  | $ 30,000,000
Commitment fee percentage |  | 0.01% |  |
Liquid assets |  | $ 20,000,000 |  |
Revolving line of credit | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Total liabilities divided by tangible net worth, not greater than |  | 0.75 |  |
Revolving line of credit | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt service coverage ratio, not less than |  | 1.25 |  |
Revolving line of credit | Selected LIBOR rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.50% |  |
Revolving line of credit | LIBOR for a fixed rate term |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.50% |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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 fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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 + Details
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