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Notes Payable and Line of Credit - Additional Information (Details) - USD ($) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2015 | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Silicon Valley Bank | Revolving Credit Facility |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility allowable amount | $ 10,000,000 |  |  |  | $ 3,000,000
Line of credit |  |  | $ 0 | $ 0 |
Line of credit facility borrowing base limitation percentage of eligible receivables | 80.00% |  |  |  |
Liquidity ratio | 125.00% |  |  |  |
Interest rate fixed percentage | $ 3,000 |  |  |  |
Line of credit facility floating rate not met | 2.00% |  | 5.00% |  |
Line of credit facility maturity date |  |  | Jan. 31, 2020 |  |
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% |  | 5.00% |  |
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 (5.0% as of September 30, 2019) (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 1.25 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 (5.0% as of September 30, 2019) (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. |  |
Silicon Valley Bank | Revolving Credit Facility | Prime Rate |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Liquidity ratio | 125.00% |  |  |  |
Silicon Valley Bank | Revolving Credit Facility | U.S. Prime Rate |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable interest rate | 1.25% |  |  |  |
Loan Agreement With Silicon Valley Bank |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Loan agreement amount |  | $ 4,000,000 |  |  |
Term of payments |  | 36 months |  |  |
Date of maturity |  | Dec. 01, 2018 |  |  |
Interest rate fixed percentage |  | 5.00% |  |  |

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