Convertible Debt at Fair Value (Tables)

3 Months Ended

Mar. 31, 2018

Convertible Debt at Fair Value [Abstract]

Difference Between Fair Value and Unpaid Principal Balance of Note

	Fair value as of March 31, 2018		Unpaid principal balance as of March 31, 2018		Fair value carrying amount over/(under) unpaid principal
6.25% Convertible Debt	$	1,049	$	1,012	$	37