Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Comprehensive Loss

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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (12,491) $ (26,575) $ (29,123) $ (43,069)
Change in unrealized (loss) gain on available-for-sale securities, net of tax (51) 8 (163) 91
Comprehensive loss $ (12,542) $ (26,567) $ (29,286) $ (42,978)