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Note 12 - Subsequent Events	12 Months Ended
	Dec. 31, 2016
Notes to Financial Statements
Subsequent Events [Text Block]	12 . Subsequent Events In January 2017, we sold 14.1 million shares of our common stock at a public offering price of $12.20 per share. We received total net proceeds of $163.7 million (net of $8.8 million in issuance costs) from the sale of the common stock. In connection with the public offering, TCP executed a waiver pursuant to which TCP waived its right to convert the Convertible Notes (see Note 7).

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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