Company Operations by Product, Customer and Geographic Area - Data by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue by Geographic Region:
Total revenues	$ 59,215	$ 103,269	$ 173,245
Long-lived Assets by Geographic Region:
Long-lived assets	29,694	35,154	120,153
U.S.
Revenue by Geographic Region:
Total revenues	59,215	101,423	172,841
Long-lived Assets by Geographic Region:
Long-lived assets	22,254	27,761	116,536
France
Long-lived Assets by Geographic Region:
Long-lived assets	196	1,365	2,257
Ireland
Revenue by Geographic Region:
Total revenues	0	1,846	404
Long-lived Assets by Geographic Region:
Long-lived assets	$ 7,244	$ 6,028	$ 1,360