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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
Restatement Adjustment
Additional Paid-in Capital
Restatement Adjustment
Accumulated Deficit
Restatement Adjustment
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Total
Increase (Decrease) in Stockholders' Equity                          
Adoption of new accounting principle | ASU 2014-09             $ 2,479 $ 2,479          
Balance, revised                 $ 405 $ 424,128 $ (516) $ (259,106) $ 164,911
Balance at Dec. 31, 2015 $ 405 $ 424,128 $ (516) $ (261,585) $ 162,432                
Balance (in shares) at Dec. 31, 2015 40,551,039               40,551,039        
Increase (Decrease) in Stockholders' Equity                          
Sale of common stock, net of issuance cost                 $ 53 119,216     119,269
Sale of common stock, net of issuance cost (in shares)                 5,272,750        
Issuance of common stock upon exercise of stock awards                 $ 7 1,153     1,160
Issuance of common stock upon exercise of stock awards (in shares)                 699,066        
Issuance of common stock under the Employee Stock Purchase Plan                 $ 1 544     545
Issuance of common stock under the Employee Stock Purchase Plan (in shares)                 45,123        
Comprehensive loss                     (925) 45,125 44,200
Stock-based compensation expense                   7,848     7,848
Balance at Dec. 31, 2016 $ 466 $ 552,889 $ (1,441) $ (213,981) $ 337,933       $ 466 552,889 (1,441) (213,981) 337,933
Balance (in shares) at Dec. 31, 2016 46,567,978               46,567,978        
Increase (Decrease) in Stockholders' Equity                          
Adoption of new accounting principle | ASU 2016-09           $ 401 $ (401)            
Balance, revised                 $ 466 553,290 (1,441) (214,382) 337,933
Issuance of common stock upon exercise of stock awards                 $ 4 2,793     2,797
Issuance of common stock upon exercise of stock awards (in shares)                 363,603        
Issuance of common stock under the Employee Stock Purchase Plan                   936     936
Issuance of common stock under the Employee Stock Purchase Plan (in shares)                 70,907        
Comprehensive loss                     (367) (38,486) (38,853)
Stock-based compensation expense                   13,651     13,651
Balance at Dec. 31, 2017                 $ 470 570,670 (1,808) (252,868) 316,464
Balance (in shares) at Dec. 31, 2017                 47,002,488        
Increase (Decrease) in Stockholders' Equity                          
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 7,609     7,617
Issuance of common stock upon exercise of stock awards (in shares)                 824,731        
Issuance of common stock under the Employee Stock Purchase Plan                 $ 1 1,119     1,120
Issuance of common stock under the Employee Stock Purchase Plan (in shares)                 57,323        
Comprehensive loss                     837 (70,409) (69,572)
Stock-based compensation expense                   20,548     20,548
Balance at Dec. 31, 2018                 $ 563 $ 845,366 $ (971) $ (323,277) $ 521,681
Balance (in shares) at Dec. 31, 2018                 56,279,542