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Statement of Stockholders' Equity - USD ($)
$ in Thousands
Scenario, Previously Reported
Common Stock
Scenario, Previously Reported
Additional Paid-in Capital
Scenario, Previously Reported
Accumulated Other Comprehensive Loss
Scenario, Previously Reported
Accumulated Deficit
Scenario, Previously Reported
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Total
Balance at Dec. 31, 2017 $ 470 $ 570,670 $ (1,808) $ (287,286) $ 282,046 $ 470 $ 570,670 $ (1,808) $ (252,868) $ 316,464
Balance (in shares) at Dec. 31, 2017 47,002,488         47,002,488        
Increase (Decrease) in Stockholders' Equity                    
Adoption of new accounting principle | ASU 2014-09                 34,418 34,418
Balance, revised           $ 470 570,670 (1,808) (252,868) 316,464
Sale of common stock, net of issuance cost           $ 84 245,420     245,504
Sale of common stock, net of issuance cost (in shares)           8,395,000        
Issuance of common stock upon exercise of stock awards           $ 8 7,060     7,068
Issuance of common stock upon exercise of stock awards (in shares)           788,409        
Issuance of common stock under the Employee Stock Purchase Plan             504     504
Issuance of common stock under the Employee Stock Purchase Plan (in shares)           26,552        
Comprehensive loss               (530) (52,210) (52,740)
Stock-based compensation expense             15,473     15,473
Balance at Sep. 30, 2018           $ 562 $ 839,127 $ (2,338) $ (305,078) $ 532,273
Balance (in shares) at Sep. 30, 2018           56,212,449