Liquidity	9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Liquidity	Liquidity The Company's net cash outflow from operating activities was approximately $19.2 million for the nine months ended September 30, 2021. As of September 30, 2021, cash and cash equivalents totaled approximately $33.1 million, which includes restricted cash of approximately $0.2 million.The Company anticipates that its current cash, cash equivalents, and available line of credit up to $7.0 million from Western Alliance Bank will be sufficient to meet its projected operating plans through at least the next twelve months from the issuance date of these financial statements. The Company’s line of credit currently expires on November 12, 2021. The Company is actively working with Western Alliance Bank to extend this line of credit prior to its expiration. The line of credit is an additional source of liquidity available to the Company, however any inability to access any portion of the amount available under this line will not have an adverse effect on the Company’s ability to satisfy its obligations or support operations. The Company does not believe any delays in or inability to obtain an extension of this line of credit will impact its ability to meet its operating objectives. The Company may, however, seek additional capital within the next twelve months, both to fund its projected operating plans after the next twelve months and/or to fund the Company’s longer-term strategic objectives. In June 2020, the Company filed a $125 million registration statement on Form S-3 with the Commission, utilizing a “shelf” registration process. Under this shelf registration process, the Company may sell securities from time to time, including up to $50 million pursuant to the At Market Issuance Sales Agreement, dated as of June 12, 2020, with B. Riley FBR, Inc. and Raymond James & Associates, Inc. (ATM Facility). During the second quarter of 2021, the Company sold an aggregate of 0.2 million shares of its common stock under the ATM Facility resulting in proceeds of $1.9 million, net of offering costs of $0.3 million. The shares sold at an average price of $10.56 per share. As of September 30, 2021, approximately $47.8 million remains available under the ATM Facility.

Liquidity

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Liquidity The Company's net cash outflow from operating activities was approximately $19.2 million for the nine months ended September 30, 2021. As of September 30, 2021, cash and cash equivalents totaled approximately $33.1 million, which includes restricted cash of approximately $0.2 million.The Company anticipates that its current cash, cash equivalents, and available line of credit up to $7.0 million from Western Alliance Bank will be sufficient to meet its projected operating plans through at least the next twelve months from the issuance date of these financial statements. The Company’s line of credit currently expires on November 12, 2021. The Company is actively working with Western Alliance Bank to extend this line of credit prior to its expiration. The line of credit is an additional source of liquidity available to the Company, however any inability to access any portion of the amount available under this line will not have an adverse effect on the Company’s ability to satisfy its obligations or support operations. The Company does not believe any delays in or inability to obtain an extension of this line of credit will impact its ability to meet its operating objectives. The Company may, however, seek additional capital within the next twelve months, both to fund its projected operating plans after the next twelve months and/or to fund the Company’s longer-term strategic objectives. In June 2020, the Company filed a $125 million registration statement on Form S-3 with the Commission, utilizing a “shelf” registration process. Under this shelf registration process, the Company may sell securities from time to time, including up to $50 million pursuant to the At Market Issuance Sales Agreement, dated as of June 12, 2020, with B. Riley FBR, Inc. and Raymond James & Associates, Inc. (ATM Facility). During the second quarter of 2021, the Company sold an aggregate of 0.2 million shares of its common stock under the ATM Facility resulting in proceeds of $1.9 million, net of offering costs of $0.3 million. The shares sold at an average price of $10.56 per share. As of September 30, 2021, approximately $47.8 million remains available under the ATM Facility.