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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 21, 2014
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
customer
Dec. 31, 2014
USD ($)
customer
Dec. 31, 2013
USD ($)
Significant Accounting Policies [Line Items]          
Percentage of consolidated revenues held by customer     10.00%    
Deferred revenue     $ 648 $ 1,300  
Short-term restricted cash     2,350 4,400  
Inventory at consigned location     $ 16,300 17,300  
Revenue growth rate     3.00%    
Percentage of weighted average cost of capital discount rate     13.50%    
Goodwill   $ 164,300 $ 164,266 0  
Foreign currency gains     (1,200) (1,000) $ (1,700)
Product shipment costs     3,800 3,700 3,100
Stock-based compensation expense     $ 100 $ 1,900 $ 1,500
Minimum [Member]          
Significant Accounting Policies [Line Items]          
Estimated useful lives of property and equipment     3 years    
Revenue growth rate     3.00%    
Intangible assets, amortization period     1 year    
Maximum [Member]          
Significant Accounting Policies [Line Items]          
Estimated useful lives of property and equipment     7 years    
Revenue growth rate     13.00%    
Intangible assets, amortization period     15 years    
Sales [Member] | Customer Concentration Risk [Member]          
Significant Accounting Policies [Line Items]          
Concentration risk, number of customers | customer     0 0  
Deerfield [Member]          
Significant Accounting Policies [Line Items]          
Number of warrants issued | shares 1,200,000