Debt	6 Months Ended
Jun. 30, 2018
Debt [Abstract]
Debt	Note 3 - Debt On August 5, 2016, the Company entered into a loan and security agreement with Silicon Valley Bank (the “Bank”) for a $1.0 million revolving line of credit (the “Revolving Line”). Under the Revolving Line, the Company may borrow the lesser of $1.0 million or 80% of its eligible accounts (subject to customary exclusions), minus the outstanding principal balance of any advances under the Revolving Line. Advances under the Revolving Line, if any, accrue interest at a floating annual rate equal to 1.75% or 1.0% above the prime rate, depending on liquidity factors. The loan agreement contains customary representations, as well as customary affirmative and negative covenants. Outstanding borrowings, if any, are collateralized by all of the Company’s assets, excluding intellectual property which is subject to a negative pledge. Advances under the Revolving Line are subject to various conditions precedent, including compliance with financial covenants relating to net liquidity relative to monthly cash burn. The Revolving Line expires March 31, 2020. There were no borrowings outstanding under this facility as of June 30, 2018 or December 31, 2017. Warrants: In connection with the funding of term loans under prior agreements, the Company issued warrants to purchase 115 shares of common stock at an exercise price of $3,132 per share and warrants to purchase 55 shares of common stock at an exercise price of $2,208 per share to the Bank and one of its affiliates. The Company valued these warrants at $2,316 per share and $1,626 per share, respectively, utilizing the Black Scholes valuation model and the following assumptions: an expected dividend yield of 0%, an expected stock price volatility of 88.07% and 87.04%, a risk-free interest rate of 1.86% and 2.20%, and an expected life of 6.25 years. The warrants were fully vested on the date of grant and expire on February 2025, and June 2025, respectively.

Note 3 - Debt

On August 5, 2016, the Company entered into a loan and security agreement with Silicon Valley Bank (the “Bank”) for a $1.0 million revolving line of credit (the “Revolving Line”). Under the Revolving Line, the Company may borrow the lesser of $1.0 million or 80% of its eligible accounts (subject to customary exclusions), minus the outstanding principal balance of any advances under the Revolving Line. Advances under the Revolving Line, if any, accrue interest at a floating annual rate equal to 1.75% or 1.0% above the prime rate, depending on liquidity factors. The loan agreement contains customary representations, as well as customary affirmative and negative covenants. Outstanding borrowings, if any, are collateralized by all of the Company’s assets, excluding intellectual property which is subject to a negative pledge. Advances under the Revolving Line are subject to various conditions precedent, including compliance with financial covenants relating to net liquidity relative to monthly cash burn. The Revolving Line expires March 31, 2020. There were no borrowings outstanding under this facility as of June 30, 2018 or December 31, 2017.

Warrants: In connection with the funding of term loans under prior agreements, the Company issued warrants to purchase 115 shares of common stock at an exercise price of $3,132 per share and warrants to purchase 55 shares of common stock at an exercise price of $2,208 per share to the Bank and one of its affiliates. The Company valued these warrants at $2,316 per share and $1,626 per share, respectively, utilizing the Black Scholes valuation model and the following assumptions: an expected dividend yield of 0%, an expected stock price volatility of 88.07% and 87.04%, a risk-free interest rate of 1.86% and 2.20%, and an expected life of 6.25 years. The warrants were fully vested on the date of grant and expire on February 2025, and June 2025, respectively.