Revenue from Contracts with Customers (ASC 606) Schedule of Financial Statement Line Items as Filed and as Adjusted (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Statement [Abstract]
Product sales	$ 39,311			$ 39,312	$ 115,417	$ 113,349
Net (loss) income	(4,344)	$ (3,293)	$ (6,254)	(1,174)	36,738	(6,410)
Statement of Financial Position [Abstract]
Current contract assets	1,407	1,655	1,439		1,407		$ 3,566
Non-current contract assets	3,449	3,747	3,912		3,449		6,971
Current contract liabilities	5,701	5,153	9,252		5,701		7,647
Non-current contract liabilities	5,194	5,198	5,263		5,194		9,070
Non-current deferred income tax asset	131	820	1,692		131		226
(Accumulated deficit) retained earnings	23,021	27,365	(19,971)		23,021		$ (15,397)
Product
Income Statement [Abstract]
Product sales	14,808	15,189	13,215	16,367	43,212	46,521
Cost of product sales	$ 10,823	12,649	8,284	$ 9,767	$ 31,756	$ 28,784
As reported
Income Statement [Abstract]
Net (loss) income		(3,454)	(6,179)
Statement of Financial Position [Abstract]
Current contract assets		3,834	3,678
Non-current contract assets		7,577	7,342
Current contract liabilities		8,119	12,211
Non-current contract liabilities		10,056	9,634
Non-current deferred income tax asset		868	1,747
(Accumulated deficit) retained earnings		25,600	(21,576)
As reported | Product
Income Statement [Abstract]
Product sales		14,694	12,874
Cost of product sales		$ 12,308	$ 7,853