Consolidated Financial Statements Detail - Additional Information 2 (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Long Term Equity Securities [Line Items]
Long-term equity securities	$ 392
Change in fair value of long-term equity securities	563
Rezolute [Member]
Long Term Equity Securities [Line Items]
Long-term equity securities	400
Change in fair value of long-term equity securities	$ 600