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Stock-Based Compensation and Employee Benefit Plans - Stock-Based Compensation Expense (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock based compensation $ 2,450,000 $ 1,244,000 $ 1,923,000
Cost of Revenues [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock based compensation 163,000 45,000 68,000
Selling, General and Administrative [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock based compensation 1,942,000 864,000 1,188,000
Research and Development [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock based compensation $ 345,000 $ 335,000 $ 667,000