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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Common Stock (Class A and B)
Additional Paid-in-Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Shares outstanding, beginning of the period (in shares) at Dec. 31, 2014   39,641,000      
Beginning of the period at Dec. 31, 2014 $ 55,819 $ 39 $ 189,168 $ 147 $ (133,535)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 11,000   11,000    
Grant of restricted stock award (in shares)   600,000      
Issuance of common stock upon exercise of stock options (in shares)   707,000      
Issuance of common stock upon exercise of stock options 2,244 $ 2 2,242    
Net loss (43,399)       (43,399)
Distribution to members (35)   (35)    
Cost of offering (4)   (4)    
Other comprehensive income (loss) 94     94  
Shares outstanding, end of the period (in shares) at Dec. 31, 2015   40,948,000      
End of the period at Dec. 31, 2015 25,719 $ 41 202,371 241 (176,934)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense 14,247   14,247    
Issuance of common stock upon exercise of stock options (in shares)   374,000      
Issuance of common stock upon exercise of stock options 1,597   1,597    
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)   (61,000)      
Tax withholdings related to net share settlements of stock-based compensation awards (761)   (761)    
Net loss (43,977)       (43,977)
Other comprehensive income (loss) 50     50  
Shares outstanding, end of the period (in shares) at Dec. 31, 2016   41,261,000      
End of the period at Dec. 31, 2016 (3,125) $ 41 217,454 291 (220,911)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation expense $ 19,476   19,476    
Grant of restricted stock award (in shares)   30,000      
Issuance of common stock upon exercise of stock options (in shares) 1,158,820 1,159,000      
Issuance of common stock upon exercise of stock options $ 12,485 $ 1 12,484    
Tax withholdings related to net share settlements of stock-based compensation awards (in shares)   (81,000)      
Tax withholdings related to net share settlements of stock-based compensation awards (1,125)   (1,125)    
Net loss (44,426)       (44,426)
Other comprehensive income (loss) (219)     (219)  
Shares outstanding, end of the period (in shares) at Dec. 31, 2017   42,369,000      
End of the period at Dec. 31, 2017 $ (16,934) $ 42 $ 248,289 $ 72 $ (265,337)