Net Income (Loss) Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 4 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
May 22, 2013
Common Class A [Member]
May 22, 2013
Common Class B [Member]
Sep. 30, 2013
Series A Preferred Stock [Member]
Sep. 30, 2013
Series B Preferred Stock [Member]
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2012
Stock Options [Member]
Sep. 30, 2013
Convertible Preferred Stock [Member]
Sep. 30, 2013
Convertible Preferred Stock [Member]
Sep. 30, 2012
Convertible Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                                  
Net income (loss) $ 2,441 $ 367   $ 2,441 $ (4,169) $ 2,483                      
Less: Undistributed earnings allocated to participating securities 0 303     0 908                      
Less: Allocation of net income to participating preferred shares - basic 0 22     0 537                      
Less: Allocation of net income to participating preferred shares - diluted 0 19     0 481                      
Net income (loss) attributable to common stockholders - basic 2,441 42     (4,169) 1,038                      
Net income (loss) attributable to common stockholders - diluted $ 2,441 $ 45     $ (4,169) $ 1,094                      
Weighted average shares outstanding used to compute basic net income (loss) per share 59,143,000 33,851,000     47,093,000 33,676,000                      
Net income (loss) per share attributable to common stockholders - basic $ 0.04 $ 0.00     $ (0.09) $ 0.03                      
Stock awards 12,205,000 6,078,000     0 5,890,000                      
Warrants 0 31,000     0 31,000                      
Weighted average shares used to compute diluted net income (loss) per share 71,348,000 39,960,000     47,093,000 39,597,000                      
Net income (loss) per share attributable to common stockholders - diluted $ 0.03 $ 0.00     $ (0.09) $ 0.03                      
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]                                  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     17,416,000 6,000 15,468,000 17,416,000         0 6,000 15,468,000 0 0 0 17,416,000
Stock Issued During Period, Shares, New Issues             6,230,000                    
Shares Sold in Public Offering, Existing Shares, Number of Shares Sold             3,200,000 2,000,000                  
Per annum dividend rate (in usd per share)                 $ 0.0282 $ 0.1374