Debt	12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	3. Debt On August 4, 2016, the Company repaid in full the $4.5 million of outstanding principal and interest under the Loan and Security Agreement, dated as of May 28, 2014, as amended (the “Loan Agreement”), between the Company and Square 1 Bank, a division of Pacific Western Bank (“Square 1”). In connection with such repayment, the Loan Agreement was terminated, and all security, liens or other encumbrances on assets of the Company were released. The Company incurred $82,685 of loan origination costs related to this credit facility. The remaining unamortized costs of approximately $38,000 were charged to interest expense upon the payment of the loan in August 2016. In connection with the funding of the term loan, the Company issued to Square 1 a warrant to purchase 22,881 shares of the Company’s common stock at an exercise price of $5.90 per share, the closing price of the Company’s common stock on the day of funding of the credit facility. During July 2016, Square 1 converted its warrant by a “cashless” conversion and received 9,887 shares of the Company’s common stock. The value determined for the warrant at the time of the grant of $108,122 was recorded as a debt discount, as well as to stockholders’ equity. The remaining unamortized debt discount associated with the warrant of approximately $59,000 was charged to interest expense upon the payment of the loan in August 2016. Total interest incurred under the loan and security agreements for the years ended December 31, 2017 and 2016 was $0 and $148,500, respectively.

3. Debt

On August 4, 2016, the Company repaid in full the $4.5 million of outstanding principal and interest under the Loan and Security Agreement, dated as of May 28, 2014, as amended (the “Loan Agreement”), between the Company and Square 1 Bank, a division of Pacific Western Bank (“Square 1”). In connection with such repayment, the Loan Agreement was terminated, and all security, liens or other encumbrances on assets of the Company were released.

The Company incurred $82,685 of loan origination costs related to this credit facility. The remaining unamortized costs of approximately $38,000 were charged to interest expense upon the payment of the loan in August 2016.

In connection with the funding of the term loan, the Company issued to Square 1 a warrant to purchase 22,881 shares of the Company’s common stock at an exercise price of $5.90 per share, the closing price of the Company’s common stock on the day of funding of the credit facility. During July 2016, Square 1 converted its warrant by a “cashless” conversion and received 9,887 shares of the Company’s common stock. The value determined for the warrant at the time of the grant of $108,122 was recorded as a debt discount, as well as to stockholders’ equity. The remaining unamortized debt discount associated with the warrant of approximately $59,000 was charged to interest expense upon the payment of the loan in August 2016.

Total interest incurred under the loan and security agreements for the years ended December 31, 2017 and 2016 was $0 and $148,500, respectively.