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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Amendment to the Common Stock Sales Agreement In August 2018, we entered into a First Amendment (the "Amendment") to the Sales Agreement, dated February 8, 2018 HCW, in connection with an “at the market offering” under which we may, from time to time, offer and sell shares of our common stock. Under the Amendment, we increased the aggregate offering price from $12,000,000 to $25,000,000. Shares sold under the Sales Agreement will be offered and sold pursuant to the Company’s Registration Statement on Form S-3, which was initially filed on July 24, 2018 and which was declared effective by the Securities and Exchange Commission on August 2, 2018 (Registration No. 333-226319). All other provisions of the Sales Agreement remain unchanged.