Summary of Significant Accounting Policies - Additional Information (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
customer
Dec. 31, 2012
customer
Restricted Cash and Cash Equivalents Items [Line Items]                      
Cash And Restricted Cash Account In Foreign Institutions $ 5,400,000       $ 3,800,000       $ 5,400,000 $ 3,800,000  
Restricted Cash Balance In Foreign Institutions 600,000       2,500,000       600,000 2,500,000  
Restricted cash 567,000       2,883,000       567,000 2,883,000  
Impairment charge against goodwill                 21,272,000 0 0
Deferred Offering Costs 300,000       400,000       300,000 400,000  
Proceeds from Issuance Initial Public Offering                 0 0 31,454,000
Debt Issuance Cost                 11,400,000 13,500,000  
Amortization of debt issuance costs                 2,433,000 2,067,000 1,174,000
Concentration Risk Number Of Customers                   2 2
Accounts receivable, allowances for doubtful accounts 739,000       991,000       739,000 991,000  
Goodwill 215,241,000       234,978,000       215,241,000 234,978,000  
Research and development                 3,782,000 4,000,000 4,683,000
Basic weighted average shares outstanding 13,810,587 13,802,212 13,799,501 13,789,426 13,786,308 11,562,465 9,759,758 9,727,127 13,800,494 11,221,005 6,981,027
Dilutive weighted average shares outstanding 13,810,587 13,817,050 13,799,501 13,789,426 13,786,308 13,813,514 9,759,758 9,727,127 13,800,494 11,834,506 6,981,027
Antidilutive common stock equivalents excluded from diluted earnings (loss) per share                 18,169 16,458 158,557
Customer Concentration Risk | Revenues                      
Restricted Cash and Cash Equivalents Items [Line Items]                      
Concentration Risk, Percentage                 30.40% 32.50% 41.50%
Concentration Risk Number Of Customers                 2    
Customer Concentration Risk | Revenues | Foreign Customers                      
Restricted Cash and Cash Equivalents Items [Line Items]                      
Concentration Risk, Percentage                 70.20% 65.80% 53.30%
Credit Concentration Risk | Accounts Receivable                      
Restricted Cash and Cash Equivalents Items [Line Items]                      
Concentration Risk, Percentage                 41.70% 41.70%  
Concentration Risk Number Of Customers                 4 3  
Intangible Assets, Net                      
Restricted Cash and Cash Equivalents Items [Line Items]                      
Prior Period Reclassification Adjustment                   $ 400,000