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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ (42,611) $ (37,949) $ 1,856
Other comprehensive income (loss):      
Net unrealized gain (loss) on investments (424) 22 28
Total other comprehensive income (loss) (424) 22 28
Comprehensive income (loss) $ (43,035) $ (37,927) $ 1,884