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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net loss $ (21,628) $ (17,150) $ (43,068) $ (33,038)
Other comprehensive income, net of tax:        
Unrealized gains on available-for-sale securities 59 0 80 0
Other comprehensive income 59 0 80 0
Comprehensive loss $ (21,569) $ (17,150) $ (42,988) $ (33,038)