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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net loss $ (471) $ (42,611) $ (37,949)
Other comprehensive income (loss):      
Net unrealized gain (loss) on investments 174 (424) 22
Total other comprehensive income (loss) 174 (424) 22
Comprehensive loss $ (297) $ (43,035) $ (37,927)