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Stockholders' Equity - RSU Activities (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of Shares      
Outstanding, beginning balance 1,818    
RSUs granted 1,308    
RSUs vested and released (896)    
RSUs forfeited (211)    
Outstanding, ending balance 2,019 1,818  
Weighted Average Grant Date Fair Value Per Share      
Outstanding, beginning balance, weighted-average grant date fair value per share $ 5.01    
RSUs granted, weighted-average grant date fair value per share 9.71    
RSUs vested and released, weighted-average grant date fair value per share 5.59    
RSUs forfeited, weighted-average grant date fair value per share 6.47    
Outstanding, ending balance, weighted-average grant date fair value per share $ 7.65 $ 5.01  
Fair value of awards vested $ 10.7 $ 2.9 $ 0.1