Loan and Security Agreement	12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]
Loan and Security Agreement	5. Loan and Security Agreement As of December 31, 2017, the Company had outstanding borrowings under an amended Loan and Security Agreement including borrowings under a revolving line of credit and a term loan. The interest rate for the revolving line of credit was 5.0% as of December 31, 2017. The term loan was repayable in 36 equal monthly installments through August 2019 and accrued interest at an annual rate of 2.0% above the greater of 3.5% or the prime rate. The interest rate for the term loan was 6.5% as of December 31, 2017. Borrowings under the amended Loan and Security Agreement were collateralized by substantially all of the Company’s assets and property. In March 2018, the Company executed the 2018 Loan and Security Modification Agreement (the “2018 Loan Modification”) to modify the amended Loan and Security Agreement to increase the revolving line of credit from $6.0 million to $11.0 million, extend the maturity date of the revolving line of credit to March 2020 and eliminate the term loan. Pursuant to the 2018 Loan Modification, borrowings under the revolving line of credit cannot exceed 80% of eligible accounts receivable balances and bear interest at one-half percent (0.5%) above the greater of 4.25% or the prime rate. Borrowings are collateralized by substantially all of the Company’s assets and property. The terms of the 2018 Loan Modification required that the existing outstanding term loan outstanding under the amended Loan and Security Agreement be repaid. Accordingly, on March 27, 2018, the Company used $2.3 million of proceeds from the revolving line of credit to repay all amounts then due on the term loan. Under the 2018 Loan Modification, the Company is subject to specified affirmative and negative covenants until maturity. These covenants include limitations on the Company’s ability to incur additional indebtedness and engage in certain fundamental business transactions, such as mergers or acquisitions. In addition, pursuant to the 2018 Loan Modification, the Company is required to maintain a financial performance covenant: a minimum asset coverage ratio of 1.5 to 1, calculated as the sum of unrestricted cash and qualified accounts receivable divided by borrowings outstanding under the revolving line of credit. Events which would meet the criteria of a default under the 2018 Loan Modification include failure to make payments when due, insolvency events, failure to comply with covenants or material adverse events with respect to the Company. As of December 31, 2018, the Company was in compliance with all covenants related to the revolving line of credit. There can be no guarantee that these covenants will be met in the future, and if not met, that waivers will be obtained. As of December 31, 2018, the Company had no amounts outstanding on the revolving line of credit and, $11.0 million was available for borrowing.

5. Loan and Security Agreement

As of December 31, 2017, the Company had outstanding borrowings under an amended Loan and Security Agreement including borrowings under a revolving line of credit and a term loan. The interest rate for the revolving line of credit was 5.0% as of December 31, 2017. The term loan was repayable in 36 equal monthly installments through August 2019 and accrued interest at an annual rate of 2.0% above the greater of 3.5% or the prime rate. The interest rate for the term loan was 6.5% as of December 31, 2017. Borrowings under the amended Loan and Security Agreement were collateralized by substantially all of the Company’s assets and property.

In March 2018, the Company executed the 2018 Loan and Security Modification Agreement (the “2018 Loan Modification”) to modify the amended Loan and Security Agreement to increase the revolving line of credit from $6.0 million to $11.0 million, extend the maturity date of the revolving line of credit to March 2020 and eliminate the term loan. Pursuant to the 2018 Loan Modification, borrowings under the revolving line of credit cannot exceed 80% of eligible accounts receivable balances and bear interest at one-half percent (0.5%) above the greater of 4.25% or the prime rate. Borrowings are collateralized by substantially all of the Company’s assets and property. The terms of the 2018 Loan Modification required that the existing outstanding term loan outstanding under the amended Loan and Security Agreement be repaid. Accordingly, on March 27, 2018, the Company used $2.3 million of proceeds from the revolving line of credit to repay all amounts then due on the term loan.

Under the 2018 Loan Modification, the Company is subject to specified affirmative and negative covenants until maturity. These covenants include limitations on the Company’s ability to incur additional indebtedness and engage in certain fundamental business transactions, such as mergers or acquisitions. In addition, pursuant to the 2018 Loan Modification, the Company is required to maintain a financial performance covenant: a minimum asset coverage ratio of 1.5 to 1, calculated as the sum of unrestricted cash and qualified accounts receivable divided by borrowings outstanding under the revolving line of credit. Events which would meet the criteria of a default under the 2018 Loan Modification include failure to make payments when due, insolvency events, failure to comply with covenants or material adverse events with respect to the Company. As of December 31, 2018, the Company was in compliance with all covenants related to the revolving line of credit. There can be no guarantee that these covenants will be met in the future, and if not met, that waivers will be obtained.

As of December 31, 2018, the Company had no amounts outstanding on the revolving line of credit and, $11.0 million was available for borrowing.