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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning balance at Dec. 31, 2017   $ 23 $ 236,184 $ (65) $ (156,589)
Issuance of common stock upon exercise of options     877    
Stock-based compensation expense     3,247    
Tax withholding upon vesting of restricted stock awards     (1,271)    
Net change in unrealized losses on available for sale securities $ (20)     (20)  
Net loss (11,117)       (11,117)
Cumulative effect of accounting changes         1,354
Ending balance at Mar. 31, 2018 72,623 23 239,037 (85) (166,352)
Beginning balance at Dec. 31, 2018 54,422 23 257,955 (41) (203,515)
Issuance of common stock upon exercise of options   1 2,120    
Stock-based compensation expense     4,415    
Tax withholding upon vesting of restricted stock awards     (3,259)    
Net change in unrealized losses on available for sale securities 43     43  
Net loss (8,019)       (8,019)
Ending balance at Mar. 31, 2019 $ 49,723 $ 24 $ 261,231 $ 2 $ (211,534)