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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues:    
Net product sales $ 31,602 $ 11,567
Operating expenses:    
Cost of product sales 14,962 3,133
Research and development 42,972 39,561
General and administrative 9,648 7,028
Sales and marketing 28,720 13,835
Total operating expenses 96,302 63,557
Loss from operations (64,700) (51,990)
Other income (expense), net 1,688 (275)
Net loss (63,012) (52,265)
Other comprehensive income (loss):    
Unrealized gain (loss) on short-term investments 123 (32)
Comprehensive loss $ (62,889) $ (52,297)
Basic and diluted net loss per share (in dollars per share) $ (0.80) $ (0.81)
Shares used in computing basic and diluted net loss per share (in shares) 78,419 64,724