Supplementary Financial Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Quarterly Financial Information [Table Text Block]

	Year Ended December 31, 201 8
	Mar. 31, 201 8 (3)			Jun. 30, 201 8			Sept. 30, 201 8			Dec. 31, 201 8 (4 )
	(in thousands, except per share amounts)
Total revenue	$	60,136		$	69,814		$	78,009		$	86,531
Gross profit		32,546			39,611			43,462			49,526
Net loss		(22,991	)		(28,464	)		(22,665	)		(21,631	)
Basic earnings per share		(0.53	)		(0.65	)		(0.52	)		(0.49	)
Diluted earnings per share		(0.53	)		(0.65	)		(0.52	)		(0.49	)

	Year Ended December 31, 201 7
	Mar. 31, 201 7			Jun. 30, 201 7			Sept. 30, 201 7 (1 )			Dec. 31, 201 7 (2 )
	(in thousands, except per share amounts)
Total revenue	$	93,584		$	84,423		$	84,511		$	85,683
Gross profit		53,513			47,835			42,071			53,084
Net income (loss)		(11,273	)		(14,967	)		(48,766	)		102
Basic earnings per share		(0.27	)		(0.36	)		(1.15	)		—
Diluted earnings per share		(0.27	)		(0.36	)		(1.15	)		—