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Common Stock Issuance (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Cash received from stock sale, before issuance costs | $ 24,368,000 | $ 16,775,000
ATM December 2020 |  |
Number of shares of common stock issued | 1,000,000 |
Terms and provisions | In December 2020, we entered into a $13.0 million ATM equity offering agreement with Craig-Hallum. Under the agreement we may, from time to time, at our discretion offer and sell shares of our common stock having an aggregate value of up to $13.0 million through Craig-Hallum. As of December 31, 2020, we had issued 1.0 million shares for net proceeds of $6.1 million that was received in January 2021. The $6.1 million is classified as subscriptions receivable on our December 31, 2020 balance sheet and is not included in the cash balance as of December 31, 2020. |
ATM November 2020 |  |
Number of shares of common stock issued | 4,900,000 |
Cash received from stock sale, before issuance costs | $ 9,600,000 |
Terms and provisions | In November 2020, we entered into a $10.0 million ATM equity offering agreement with Craig-Hallum Capital Group. Under the agreement we were able to, from time to time, at our discretion offer and sell shares of our common stock having an aggregate value of up to $10.0 million through Craig-Hallum. As of December 31, 2020, we had completed sales under such sales agreement, having sold 4.9 million shares for net proceeds of $9.6 million. |
Purchase Agreement December 2019 |  |
Number of shares of common stock issued | 375,000 |
Cash received from stock sale, before issuance costs | $ 277,000 |
Stock issuance costs | $ 90,000 |
Terms and provisions | In December 2019, we entered into a Common Stock Purchase Agreement with Lincoln Park granting us the right to sell shares of our common stock having an aggregate value of up to $16.0 million. Under the terms of the agreement, Lincoln Park made an initial purchase of 1.5 million shares of common stock for $1.0 million at a purchase price of $0.6531 per share. Subject to various limitations and conditions set forth in the agreement, we were able to sell up to an additional $15.0 million in shares of common stock, from time to time, at our sole discretion to Lincoln Park over a 24-month period beginning December 2019. In consideration for entering into the agreement, we issued 375,000 shares of our common stock, having a value of $277,000, based on the closing stock price at the date of grant, to Lincoln Park as a commitment fee. We incurred an additional $90,000 in issuance costs. As of December 31, 2020, we had completed sales under such sales agreement, having sold 22.2 million shares for net proceeds of $15.6 million. |
Direct July 2019 |  |
Number of shares of common stock issued | 3,000,000 |
Cash received from stock sale, before issuance costs | $ 2,000,000 |
Stock issuance costs | $ 24,000 |
Terms and provisions | In July 2019, we raised $2.0 million before issuance costs of approximately $24,000 through a registered direct offering of 3.0 million shares of our common stock to a private investor. |
Direct April 2019 |  |
Number of shares of common stock issued | 2,300,000 |
Cash received from stock sale, before issuance costs | $ 2,000,000 |
Stock issuance costs | $ 34,000 |
Terms and provisions | In April 2019, we raised $2.0 million before issuance costs of approximately $34,000 through a registered direct offering of 2.3 million shares of our common stock to a private investor. |
Purchase Agreement April 2019 |  |
Number of shares of common stock issued | 15,700,000 |
Cash received from stock sale, before issuance costs | $ 11,000,000 |
Terms and provisions | In April 2019, we entered into a Common Stock Purchase Agreement with Lincoln Park granting us the right to sell shares of our common stock having an aggregate value of up to $11.0 million. Under the terms of the agreement, Lincoln Park made an initial purchase of $1.0 million in shares of common stock at a purchase price of $0.98 per share. Subject to various limitations and conditions set forth in the agreement, we may sell up to an additional $10.0 million in shares of common stock, from time to time, at our sole discretion to Lincoln Park over a 24-month period beginning April 2019. In consideration for entering into the agreement, we issued 250,000 shares of our common stock, having a value of $258,000, based on the closing stock price at the date of grant, to Lincoln Park as a commitment fee. We incurred an additional $92,000 in issuance costs. As of December 31, 2019, we have issued 15.7 million shares and raised a total of $11.0 million under this agreement. No further shares are available for sales under this agreement. |
Direct January 2019 |  |
Number of shares of common stock issued | 2,000,000 |
Cash received from stock sale, before issuance costs | $ 1,200,000 |
Stock issuance costs | $ 26,000 |
Terms and provisions | In January 2019, we raised $1.2 million before issuance costs of approximately $26,000 through a registered direct offering of 2.0 million shares of our common stock to a private investor. |

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