Subsequent Event (Narrative) (Details)	1 Months Ended
	Feb. 28, 2021	Jan. 31, 2021
Subsequent Event Narrative Details
Subsequent Event, Date	Feb. 01, 2021	Jan. 01, 2021
Subsequent Event, Description	In February 2021, we entered into a $50.0 million ATM equity offering agreement with Craig-Hallum. Under the agreement we were able, at our discretion, to offer and sell shares of our common stock having an aggregate value of up to $50.0 million through Craig-Hallum. We have issued 2.5 million shares of our common stock for net proceeds of $48.7 million under this ATM agreement. No further shares are available for sales under this agreement.	In January 2021, we issued 1.1 million shares of our common stock for net proceeds of $6.6 million under the December 2020 ATM equity offering agreement with Craig-Hallum. In January 2021, we also received $6.1 million for the 1.0 million shares of common stock that were issued in December 2020. In total, we have issued 2.1 million shares of our common stock for net proceeds of $12.7 million under this ATM agreement. No further shares are available for sales under this agreement.