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Long-term Notes Payable (including current portion) and Line of Credit - Additional Information (Details) |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2017 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 USD ($) Installment | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loan Agreement With Silicon Valley Bank |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Loan agreement amount |  |  | $ 4,000,000 |  | $ 4,000,000 |
Term of payments |  |  | 36 months |  |  |
Date of maturity |  |  | Dec. 01, 2018 |  |  |
Liquidity ratio |  |  |  |  | 125.00% |
Interest rate fixed percentage |  |  | 5.00% |  |  |
Loan Agreement With Silicon Valley Bank | Maximum |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Unrestricted Cash Required For Line Of Credit Covenant |  |  |  |  | $ 25,000,000 |
Silicon Valley Bank | Revolving Credit Facility | Growth Capital Term Loan |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility allowable amount |  |  |  | $ 750,000 |  |
Line of credit facility, payment terms |  |  |  |  | The growth capital term loan required interest only payments through June 30, 2014 at which point it was to be repaid in 32 equal monthly installments of interest and principal. |
Number of monthly installments for principal and interest payment | Installment |  |  |  | 32 |  |
Line of credit facility maturity date |  |  |  |  | Feb. 01, 2017 |
Payment of principal and accrued interest | $ 55,230 |  |  |  |  |
Line of credit facility interest rate |  |  |  | 6.50% |  |
Line of credit |  |  |  |  | $ 0 | $ 0
Silicon Valley Bank | Revolving Credit Facility |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility allowable amount |  | $ 10,000,000 |  |  |  |
Line of credit facility maturity date |  |  |  |  | Jan. 31, 2020 |
Line of credit |  |  |  |  | $ 0 |
Liquidity ratio |  | 125.00% |  |  |  |
Line of credit facility borrowing base limitation percentage of eligible receivables |  | 80.00% |  |  |  |
Interest rate fixed percentage |  | $ 3,000 |  |  |  |
Line of credit facility frequency of payments on monthly installments |  |  |  |  | Borrowings outstanding under the term loan under the amended and restated loan and security agreement will continue to be repaid in equal monthly installments of interest and principal and matures on December 1, 2018. |
Silicon Valley Bank | Revolving Credit Facility | The Wall Street Journal Prime Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  | 1.00% |  |  |  |
Line of credit facility interest rate description |  |  |  |  | The Company will be required to pay interest on borrowings outstanding, if any, under the revolving line of credit at a floating rate per annum equal to 1% above the Wall Street Journal prime rate (5.00% as of September 30, 2018) (or, if unavailable, the Silicon Valley Bank prime rate) on a monthly basis, so long as the Company maintains a liquidity ratio of cash and cash equivalents plus accounts receivable to outstanding debt under the Amended Loan Agreement minus deferred revenue of 1.50 to 1.00. If this liquidity ratio is not met, the Company will be subject to a minimum interest charge of $3,000 per month and borrowings outstanding, if any, under the revolving line of credit will accrue interest at a floating rate per annum equal to 2% above the Wall Street Journal prime rate (5.00% as of September 30, 2018) (or, if unavailable the Silicon Valley Bank prime rate) on a monthly basis. Prior to the amendment in January 2018, the revolving line of credit bore interest rate at the U.S. prime rate plus 1.25%. The revolving line of credit matures on January 31, 2020. |
Line of credit facility floating rate not met |  | 2.00% |  |  |  |
Silicon Valley Bank | Revolving Credit Facility | Prime Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Liquidity ratio |  | 150.00% |  |  |  |
Silicon Valley Bank | Revolving Credit Facility | U.S. Prime Rate |  |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  | 1.25% |  |  |  |

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