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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Balances (in shares) at Dec. 31, 2017   40,669,000      
Balance at beginning of period at Dec. 31, 2017 $ 279,483 $ 41 $ 669,032 $ (389,136) $ (454)
Increase (Decrease) in Stockholders' Equity          
Exercise of stock options (in shares)   103,000      
Exercise of stock options 1,492 $ 0 1,492    
Vested restricted stock units (in shares)   148,000      
Vested restricted stock units $ 0 $ 0      
Shares issued under employee stock purchase plan (shares) 34,985 35,000      
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 952   952    
Stock-based compensation 15,432   15,432    
Net unrealized gain (loss) on investments (91)       (91)
Net loss (8,116)     (8,116)  
Balances (in shares) at Jun. 30, 2018   40,955,000      
Balance at end of period at Jun. 30, 2018 290,513 $ 41 686,888 (395,871) (545)
Increase (Decrease) in Stockholders' Equity          
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 2) 1,361     1,361  
Net unrealized gain (loss) on investments 356        
Net loss 2,564        
Balances (in shares) at Jun. 30, 2018   40,955,000      
Balance at end of period at Jun. 30, 2018 $ 290,513 $ 41 686,888 (395,871) $ (545)
Increase (Decrease) in Stockholders' Equity          
Cumulative effect adjustment of the adoption of Accounting Standards Update 2016-09 (Note 2)     $ (20) $ 20