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Subsequent Events - Additional Information (Details) - USD ($) | Dec. 08, 2016 | Nov. 23, 2016 | Nov. 09, 2016 | Dec. 15, 2016 | Sep. 30, 2016 | Dec. 31, 2015 | Mar. 28, 2014
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Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock, par value |  |  |  |  | $ 0.001 | $ 0.001 |
Purchase price per share |  |  |  |  | $ 0.0045 |  |
Letter of Credit |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 5,000,000
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Additional number of common stock purchase by underwriters from exercising option |  | 877,500 |  |  |  |  |
Common stock sold by underwriters from exercising option |  | 877,500 |  |  |  |  |
Net proceed received from underwriter option exercise after deducting underwriting discounts and commissions |  | $ 9,073,000 |  |  |  |  |
Subsequent Event | Jeffries Finance LLC | Senior Secured Revolving Credit Facility |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 45,000,000 |  |  |  |  |  |
Credit facility agreement, term | 3 years |  |  |  |  |  |
Facility termination date | Dec. 08, 2019 |  |  |  |  |  |
Percentage of commitment fee | 0.375% |  |  |  |  |  |
Default rate, additional to interest rate | 2.00% |  |  |  |  |  |
Line of credit |  |  |  | $ 0 |  |  |
Subsequent Event | Jeffries Finance LLC | Senior Secured Revolving Credit Facility | ABR |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Default rate, additional to interest rate | 2.00% |  |  |  |  |  |
Subsequent Event | Jeffries Finance LLC | Senior Secured Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Interest rate | 3.00% |  |  |  |  |  |
Subsequent Event | Jeffries Finance LLC | Senior Secured Revolving Credit Facility | Minimum | ABR |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Interest rate | 2.00% |  |  |  |  |  |
Subsequent Event | Jeffries Finance LLC | Senior Secured Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Interest rate | 4.00% |  |  |  |  |  |
Subsequent Event | Jeffries Finance LLC | Senior Secured Revolving Credit Facility | Maximum | ABR |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Interest rate | 3.00% |  |  |  |  |  |
Subsequent Event | Jeffries Finance LLC | Letter of Credit |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 10,000,000 |  |  |  |  |  |
Fronting fee per annum, percent | 0.25% |  |  |  |  |  |
Subsequent Event | Initial Public Offering |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Common stock, shares issued |  |  | 11,700,000 |  |  |  |
Common stock, par value |  |  | $ 0.001 |  |  |  |
Purchase price per share |  |  | 11.00 |  |  |  |
Share price, net of underwriting discount |  |  | $ 10.34 |  |  |  |
Net proceed received from IPO after deducting underwriting discounts and commissions |  |  | $ 120,978,000 |  |  |  |
Additional common stock, shares issued to underwriters |  |  | 877,500 |  |  |  |
Underwriters option granted period |  |  | 30 days |  |  |  |

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- Definition Face amount or stated value per share of common stock. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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