Goodwill and Intangible Assets - Gross Value and Net Carrying Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2019
Amortizable intangible assets:
Gross Value	$ 85,172	$ 12,061
Accumulated Amortization	(17,456)	(10,837)
Impairment	(66,087)
Net Carrying Amount	1,629	1,224
Unamortizable intangible assets:
Gross Value	18,491	18,491
Accumulated Amortization	0	0
Net Carrying Amount	18,491	18,491
Developed technology | Noctiva
Amortizable intangible assets:
Gross Value	73,111	0
Accumulated Amortization	(7,024)	0
Impairment	(66,087)
Net Carrying Amount	0	0
Developed technology | Vazculep
Amortizable intangible assets:
Gross Value	12,061	12,061
Accumulated Amortization	(10,432)	(10,837)
Impairment	0
Net Carrying Amount	$ 1,629	$ 1,224