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Subsequent Event	3 Months Ended
Subsequent Event	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In April 2016, we sold an additional 264,234 shares of our common stock at a weighted average price of $9.17 per share under the ATM, leaving $158.6 million available under the shelf registration statement, $68.1 million of which may be offered, issued and sold at a future date under the ATM. Estimated net proceeds to us from the ATM offerings in April 2016 were $2.3 million, after deducting underwriter commissions of $73,000 and estimated offering expenses of $45,000.