Credit Facility	12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]
Credit Facility	Credit Facility The Company is party to a Loan and Security Agreement, or the Credit Facility, with a bank. As of December 31, 2017, the Credit Facility permitted the Company to borrow up to $2.5 million on a revolving basis. The Credit Facility was subsequently amended, most recently on January 17, 2018 and extended until January 15, 2019. Amounts borrowed under the Credit Facility will bear interest equal to the prime rate plus 0.5%. Any borrowings under the Credit Facility will be collateralized by the Company’s cash, accounts receivable, inventory, and equipment. The Credit Facility also includes traditional lending and reporting covenants. These include certain financial covenants applicable to liquidity that are to be maintained by the Company. As of December 31, 2017, the Company was in compliance with these covenants and had not borrowed any funds under the Credit Facility. However, $0.2 million of the amount under the Credit Facility is restricted to support letters of credit issued in favor of our facilities landlords. Consequently, the amount available for borrowing under the Credit Facility as of December 31, 2017 was approximately $2.3 million.

Credit Facility

12 Months Ended

Dec. 31, 2017

The Company is party to a Loan and Security Agreement, or the Credit Facility, with a bank. As of December 31, 2017, the Credit Facility permitted the Company to borrow up to $2.5 million on a revolving basis. The Credit Facility was subsequently amended, most recently on January 17, 2018 and extended until January 15, 2019. Amounts borrowed under the Credit Facility will bear interest equal to the prime rate plus 0.5%. Any borrowings under the Credit Facility will be collateralized by the Company’s cash, accounts receivable, inventory, and equipment. The Credit Facility also includes traditional lending and reporting covenants. These include certain financial covenants applicable to liquidity that are to be maintained by the Company. As of December 31, 2017, the Company was in compliance with these covenants and had not borrowed any funds under the Credit Facility. However, $0.2 million of the amount under the Credit Facility is restricted to support letters of credit issued in favor of our facilities landlords. Consequently, the amount available for borrowing under the Credit Facility as of December 31, 2017 was approximately $2.3 million.