Debt and Revolving Loan	12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]
Debt and Revolving Loan	(5) Debt and Revolving Loan On July 25, 2017, the Company entered into a Credit and Security Agreement, or the Term Loan Credit Agreement, and a Credit and Security Agreement, or the Revolving Credit Agreement with Midcap, and, together with the Term Loan Credit Agreement, the Credit Agreements, which replaced the Company’s then-existing Silicon Valley Bank Loan Agreement, or the SVB Loan Agreement. Upon executing the Credit Agreements, the Company repaid in full its indebtedness under the SVB Loan Agreement, which totaled approximately $5.0 million related to a revolving line of credit, or the Revolving Line of Credit. In connection with the refinancing, the Company was forgiven a commitment fee payable of approximately $0.8 million, which was included in long term liabilities, net of the current portion included in accrued and other current liabilities in the consolidated balance sheet, and corresponding warrants of approximately $0.1 million related to the SVB Loan Agreement were extinguished. The Company also recorded an expense of approximately $16 thousand related to the write-off of related issuance costs, which has been included in interest expense in the consolidated statements of operations. Unamortized debt issuance costs from the SVB Loan Agreement related to the modification will be amortized over the term of the new Credit Agreements. Under the terms of the Term Loan Credit Agreement, as of July 25, 2017, Midcap funded $25.0 million to the Company, the Closing Date Term Loan. Midcap also made available to the Company until March 31, 2018, a $10.0 million term loan, or the March 2018 Term Loan, subject to the satisfaction of certain conditions, including FDA certifications of the manufacturing facility operated by Vesta, and an additional $5.0 million term loan, subject to the satisfaction of certain conditions, including evidence that the Company’s Net Revenue for the past 12 months was greater than or equal to $75.0 million, as defined in the Term Loan Credit Agreement, collectively the Term Loans. Under the Revolving Credit Agreement, Midcap made available to the Company a revolving line of credit, or the Revolving Loan. The amount of loans available to be drawn is based on a borrowing base equal to 85% of the net collectible value of eligible (as defined by the agreement) accounts receivable plus 40% of eligible (as defined by the agreement) finished goods inventory, or the Borrowing Base, provided that availability from eligible finished goods inventory does not exceed 20% of the Borrowing Base. The Company used the proceeds to repay in full the Company’s then-existing indebtedness under its SVB Loan Agreement and to pay fees and expenses in connection with the foregoing and the Company intends to use the proceeds for general corporate purposes. Any indebtedness under the Term Loan Credit Agreement bears interest at a floating per annum rate equal to the LIBOR as reported by Midcap with a floor of 1.00%, which as of December 31, 2017 was 1.36%, plus 7.50%. The Term Loans have a scheduled maturity date of December 1, 2021, or the Maturity Date. The Company must make monthly payments of accrued interest under the Term Loans from the funding date of the Term Loans, until December 31, 2018, followed by monthly installments of principal and interest through the Maturity Date. The Company may prepay all of the Term Loans prior to its maturity date provided the Company pays Midcap a prepayment fee. The Company paid an origination fee of 0.50% of the Term Loans total amount of $40.0 million on the closing date. As of December 31, 2017, there was $25.0 million outstanding related to the Term Loans. As of December 31, 2017, the unamortized debt issuance costs on the Term Loans was approximately $0.3 million and are included as a reduction to the current portion of long-term debt on the consolidated balance sheet. Any indebtedness under the Revolving Credit Agreement bears interest at a floating per annum rate equal to the LIBOR as reported by Midcap with a floor of 1.00%, plus 4.50%. The Company may make and repay borrowings from time to time under the Revolving Credit Agreement until the maturity of the facility on December 1, 2021. The Company is required to pay an annual collateral management fee of 0.50% on the outstanding balance, and an annual unused line fee of 0.50% of the average unused portion. The Company may prepay all of the outstanding balance prior to the maturity date provided the Company pays Midcap a prepayment fee. The Company paid an origination fee of 0.50% of the Revolving Loan amount of $10.0 million on the closing date. As of December 31, 2017, there were no borrowings outstanding related to the Revolving Loan. As of December 31, 2017, the unamortized debt issuance costs related to the Revolving Loan was approximately $0.1 million and was included in prepaid expenses and other current assets on the consolidated balance sheet. The amortization of debt issuance costs for the year ended December 31, 2017 was $0.1 million, relating to the Revolving Line of Credit, the Term Loans, and the Revolving Loan and were included in interest expense in the consolidated statement of operations. The Credit Agreements includes customary affirmative and restrictive covenants and representations and warranties, including a financial covenant for minimum revenues, a financial covenant for minimum cash requirements, a covenant against the occurrence of a “change in control,” financial reporting obligations, and certain limitations on indebtedness, liens, investments, distributions, collateral, mergers or acquisitions, taxes, and deposit accounts. Upon the occurrence of an event of default, a default interest rate of an additional 5.0% may be applied to any outstanding principal balances, and Midcap may declare all outstanding obligations immediately due and payable and take such other actions as set forth in the Credit Agreements. The Company’s obligations under the Credit Agreements are secured by a security interest in substantially all of The Company’s assets, other than intellectual property. While the Company was in compliance with the financial covenants in its credit agreement with MidCap at December 31, 2017, given the potential violations of those covenants during fiscal year 2018, as discussed in Note 2, the Company has classified the debt, net of unamortized debt issuance costs, as current in the consolidated balance sheet at December 31, 2017. On this basis, as of December 31, 2017, the future debt payments of $25.0 million are considered payable in 2018.

(5) Debt and Revolving Loan

On July 25, 2017, the Company entered into a Credit and Security Agreement, or the Term Loan Credit Agreement, and a Credit and Security Agreement, or the Revolving Credit Agreement with Midcap, and, together with the Term Loan Credit Agreement, the Credit Agreements, which replaced the Company’s then-existing Silicon Valley Bank Loan Agreement, or the SVB Loan Agreement. Upon executing the Credit Agreements, the Company repaid in full its indebtedness under the SVB Loan Agreement, which totaled approximately $5.0 million related to a revolving line of credit, or the Revolving Line of Credit. In connection with the refinancing, the Company was forgiven a commitment fee payable of approximately $0.8 million, which was included in long term liabilities, net of the current portion included in accrued and other current liabilities in the consolidated balance sheet, and corresponding warrants of approximately $0.1 million related to the SVB Loan Agreement were extinguished. The Company also recorded an expense of approximately $16 thousand related to the write-off of related issuance costs, which has been included in interest expense in the consolidated statements of operations. Unamortized debt issuance costs from the SVB Loan Agreement related to the modification will be amortized over the term of the new Credit Agreements.

Under the terms of the Term Loan Credit Agreement, as of July 25, 2017, Midcap funded $25.0 million to the Company, the Closing Date Term Loan. Midcap also made available to the Company until March 31, 2018, a $10.0 million term loan, or the March 2018 Term Loan, subject to the satisfaction of certain conditions, including FDA certifications of the manufacturing facility operated by Vesta, and an additional $5.0 million term loan, subject to the satisfaction of certain conditions, including evidence that the Company’s Net Revenue for the past 12 months was greater than or equal to $75.0 million, as defined in the Term Loan Credit Agreement, collectively the Term Loans. Under the Revolving Credit Agreement, Midcap made available to the Company a revolving line of credit, or the Revolving Loan. The amount of loans available to be drawn is based on a borrowing base equal to 85% of the net collectible value of eligible (as defined by the agreement) accounts receivable plus 40% of eligible (as defined by the agreement) finished goods inventory, or the Borrowing Base, provided that availability from eligible finished goods inventory does not exceed 20% of the Borrowing Base. The Company used the proceeds to repay in full the Company’s then-existing indebtedness under its SVB Loan Agreement and to pay fees and expenses in connection with the foregoing and the Company intends to use the proceeds for general corporate purposes.

Any indebtedness under the Term Loan Credit Agreement bears interest at a floating per annum rate equal to the LIBOR as reported by Midcap with a floor of 1.00%, which as of December 31, 2017 was 1.36%, plus 7.50%. The Term Loans have a scheduled maturity date of December 1, 2021, or the Maturity Date. The Company must make monthly payments of accrued interest under the Term Loans from the funding date of the Term Loans, until December 31, 2018, followed by monthly installments of principal and interest through the Maturity Date. The Company may prepay all of the Term Loans prior to its maturity date provided the Company pays Midcap a prepayment fee. The Company paid an origination fee of 0.50% of the Term Loans total amount of $40.0 million on the closing date. As of December 31, 2017, there was $25.0 million outstanding related to the Term Loans. As of December 31, 2017, the unamortized debt issuance costs on the Term Loans was approximately $0.3 million and are included as a reduction to the current portion of long-term debt on the consolidated balance sheet.

Any indebtedness under the Revolving Credit Agreement bears interest at a floating per annum rate equal to the LIBOR as reported by Midcap with a floor of 1.00%, plus 4.50%. The Company may make and repay borrowings from time to time under the Revolving Credit Agreement until the maturity of the facility on December 1, 2021. The Company is required to pay an annual collateral management fee of 0.50% on the outstanding balance, and an annual unused line fee of 0.50% of the average unused portion. The Company may prepay all of the outstanding balance prior to the maturity date provided the Company pays Midcap a prepayment fee. The Company paid an origination fee of 0.50% of the Revolving Loan amount of $10.0 million on the closing date. As of December 31, 2017, there were no borrowings outstanding related to the Revolving Loan. As of December 31, 2017, the unamortized debt issuance costs related to the Revolving Loan was approximately $0.1 million and was included in prepaid expenses and other current assets on the consolidated balance sheet.

The amortization of debt issuance costs for the year ended December 31, 2017 was $0.1 million, relating to the Revolving Line of Credit, the Term Loans, and the Revolving Loan and were included in interest expense in the consolidated statement of operations.

The Credit Agreements includes customary affirmative and restrictive covenants and representations and warranties, including a financial covenant for minimum revenues, a financial covenant for minimum cash requirements, a covenant against the occurrence of a “change in control,” financial reporting obligations, and certain limitations on indebtedness, liens, investments, distributions, collateral, mergers or acquisitions, taxes, and deposit accounts. Upon the occurrence of an event of default, a default interest rate of an additional 5.0% may be applied to any outstanding principal balances, and Midcap may declare all outstanding obligations immediately due and payable and take such other actions as set forth in the Credit Agreements. The Company’s obligations under the Credit Agreements are secured by a security interest in substantially all of The Company’s assets, other than intellectual property.

While the Company was in compliance with the financial covenants in its credit agreement with MidCap at December 31, 2017, given the potential violations of those covenants during fiscal year 2018, as discussed in Note 2, the Company has classified the debt, net of unamortized debt issuance costs, as current in the consolidated balance sheet at December 31, 2017. On this basis, as of December 31, 2017, the future debt payments of $25.0 million are considered payable in 2018.