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Warrants	3 Months Ended
Warrants	Mar. 31, 2020
Debt Disclosure [Abstract]
Warrants	Warrants We issued 992 thousand warrants in connection with a private placement of our common stock in April 2012. Each warrant gives the holder thereof the right to purchase one share of common stock at an exercise price equal to $10.00. The warrants were issued with an aggregate fair value of $5.1 million. During the three months ended March 31, 2020, nine thousand warrants were exercised resulting in the issuance of six thousand shares of common stock. Upon exercise, we reclassified approximately $0.2 million of warrant fair value from warrant liability to additional paid-in capital, of which $8 thousand related to changes in fair value during the three months ended March 31, 2020. During the three months ended March 31, 2019, 67 thousand warrants were exercised resulting in the issuance of 39 thousand shares of common stock. Upon exercise, we reclassified approximately $0.9 million of warrant fair value from warrant liability to additional paid-in capital, of which $0.3 million related to changes in fair value during the three months ended March 31, 2019.