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Other Borrowings - Additional Information (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 12, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2017 | Oct. 13, 2016
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, amount |  |  |  | $ 20,650,000 |  |
Repayment of lines of credit |  | $ 16,200,000 | $ 20,650,000 | 9,350,000 |  |
Short-term credit lines available for use, outstanding |  |  | $ 0 | $ 0 |  |
Ridgestone | CIBC Bank USA | Credit agreement |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, amount |  |  |  |  |  | $ 30,000,000
Line of credit facility, commitment fee payable |  |  |  |  |  | $ 300,000
Line of credit facility, maturity date |  |  | Oct. 12, 2017 |  |  |
Line of credit facility, interest rate |  |  |  | 3.75% |  |
Ridgestone | CIBC Bank USA | Amended Credit Agreement |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, revolving credit conversion to non-revolving line of credit, description |  |  | In April 2017, the revolving line of credit was amended to a non-revolving line of credit as long as the outstanding balance exceeds $5.0 million. |  |  |
Line of credit facility, revolving credit conversion to non-revolving line of credit, threshold amount |  |  |  |  | $ 5,000,000 |
Threshold amount for conversion of line of credit into revolving line of credit |  |  |  |  | 5,000,000 |
Revolving line of credit facility, maximum borrowing capacity |  |  |  |  | $ 5,000,000 |
Line of credit facility, extended maturity date | Oct. 11, 2018 |  |  |  |  |
Line of credit facility, interest rate terms | The amended revolving line of credit bears interest at either the London Interbank Offered Rate (“LIBOR”) Rate plus 250 basis points or the Prime Rate minus 25 basis points, based on the Company’s election, which is required to be communicated to CIBC at least three business days prior to the commencement of an interest period. If the Company fails to provide timely notification, the interest rate will be Prime Rate minus 25 basis points. As of December 31, 2017, the line of credit has not been drawn upon, so an interest rate option has not been selected. |  |  |  |  |
Ridgestone | CIBC Bank USA | Amended Credit Agreement | LIBOR Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate spread | 2.50% |  |  |  |  |
Ridgestone | CIBC Bank USA | Amended Credit Agreement | Prime Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Interest rate spread | 0.25% |  |  |  |  |

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- Definition Line of credit facility extended maturity date. + References No definition available. + Details
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- Definition Line of credit facility revolving credit conversion to non revolving credit threshold limit. + References No definition available. + Details
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- Definition Threshold amount for conversion of line of credit to revolving line of credit. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -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 Date the credit facility terminates, in CCYY-MM-DD format. + 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 Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 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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- Definition Describes when borrowings outstanding under a line of credit will convert to a term loan, and describes the repayment terms, collateral, and priority (seniority) of the term loan. + 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 The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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