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Stockholders' Deficit - Additional Information (Detail) - USD ($)
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2007
Limited Partners' Capital Account [Line Items]          
Shares issued 0 0      
Weighted average fair value stock options granted $ 3.62 $ 7.17 $ 4.22 $ 3.03  
Expected dividend yield 0.00% 0.00% 0.00% 0.00%  
Total fair value of other stock awards vested $ 1,866,000 $ 2,340,000 $ 1,458,000 $ 2,475,000  
Tax benefits from additional paid-in-capital adjustments 84,000 185,000 0 96,000  
Stock Options [Member]          
Limited Partners' Capital Account [Line Items]          
Stock-based compensation expense 386,000 671,000 464,000 528,000  
Aggregate intrinsic value of stock options exercised 31,000 52,000 23,000 0  
Unrecognized stock-based compensation expense   $ 1,225,000      
Unrecognized stock-based compensation expense, weighted average period   2 years 3 months 18 days      
Restricted Stock, Restricted Stock Units and Performance Stock Units [Member]          
Limited Partners' Capital Account [Line Items]          
Stock-based compensation expense 1,202,000 $ 2,314,000 1,861,000 1,609,000  
Income taxes associated with stock-based compensation expense 0 19,000 0 0  
Restricted Stock and Restricted Stock Unit [Member]          
Limited Partners' Capital Account [Line Items]          
Unrecognized stock-based compensation expense   $ 2,674,000      
Unrecognized stock-based compensation expense, weighted average period   1 year 9 months 18 days      
Incremental compensation expense   $ 270,000      
Amended and Restated 1997 Employee Stock Purchase Plan [Member]          
Limited Partners' Capital Account [Line Items]          
Stock-based compensation expense $ 52,000 $ 94,000 $ 79,000 $ 99,000  
Non-Employee Director [Member] | Restricted Stock Awards [Member]          
Limited Partners' Capital Account [Line Items]          
Options vesting period   3 years      
Minimum [Member] | 2006 Stock Incentive Plan [Member]          
Limited Partners' Capital Account [Line Items]          
Options vesting period   1 year      
Maximum [Member]          
Limited Partners' Capital Account [Line Items]          
Preferred stock authorized to issue   944,000      
Maximum [Member] | 2006 Stock Incentive Plan [Member]          
Limited Partners' Capital Account [Line Items]          
Options vesting period   4 years      
Options granted period   10 years      
Class A Common Stock [Member]          
Limited Partners' Capital Account [Line Items]          
Issuances of Class A common stock       11,500,000  
Share price       $ 4.00  
Net proceeds from the registered public offering       $ 42,184,000  
Common stock, authorized shares   1,200,000      
Number of shares available for future grant   255,000      
Class A Common Stock [Member] | 2006 Stock Incentive Plan [Member]          
Limited Partners' Capital Account [Line Items]          
Common stock, authorized shares         2,475,000
Number of shares available for future grant   956,000