Company Operations by Product, Customer and Geographic Area - Data by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue by Geographic Region:
Total revenues	$ 103,269	$ 173,245	$ 150,246
Long-lived Assets by Geographic Region:
Long-lived assets	35,154	120,153	44,747
United States
Revenue by Geographic Region:
Total revenues		172,841	147,283
Long-lived Assets by Geographic Region:
Long-lived assets	27,761	116,536	42,021
France
Long-lived Assets by Geographic Region:
Long-lived assets	1,365	2,257	2,524
Ireland
Revenue by Geographic Region:
Total revenues	1,846	404	2,963
Long-lived Assets by Geographic Region:
Long-lived assets	$ 6,028	$ 1,360	$ 202