Note 9 - Debt (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Long-term Debt Instruments [Table Text Block]

	Principal Amount of 2020 Notes			Debt Discount			Debt Issue Costs			Total 2020 Notes			2020 Notes Embedded Derivative			Total 2020 Notes and 2020 Notes Embedded Derivative
Balance - December 31, 2017	$	16,657		$	(2,501	)	$	(665	)	$	13,491		$	5,224		$	18,715
Amortization of debt discount		-			1,094			-			1,094			-			1,094
Amortization of debt issue costs		-			-			309			309			-			309
Paid-in-kind interest		304			-			-			304			-			304
Change in fair value of 2020 Notes embedded derivative		-			-			-			-			(2,637	)		(2,637	)
Conversion of 2020 Notes into common stock		(3,186	)		428			114			(2,644	)		(2,193	)		(4,837	)
Balance - December 31,2018	$	13,775		$	(979	)	$	(242	)	$	12,554		$	394		$	12,948

	Principal Amount of 2022 Notes			Total
Balance - December 31, 2017	$	515		$	515
Exchange of 2022 Notes		(515	)		(515	)
Balance - December 31, 2018	$	-		$	-

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details