Share-Based Payments - Schedule of Stock-Based Compensation Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation costs	$ 61	$ 8,846	$ 9,115	$ 20,208
Cost of products
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation costs	4	25	12	50
Cost of services
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation costs	52	79	117	156
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation costs	1,882	2,376	3,727	5,634
Selling, general and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation costs	$ (1,877)	$ 6,366	$ 5,259	$ 14,368