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Summary of Operations and Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands, £ in Millions
 12 Months Ended
Mar. 14, 2014
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2016
GBP (£)
shares
Jun. 15, 2016
USD ($)
Jun. 15, 2016
GBP (£)
Nov. 30, 2014
Jan. 20, 2010
Accounting Policies [Line Items]                  
Common stock authorized (in shares) | shares   100,000,000 100,000,000   100,000,000        
Common stock par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001            
Preferred stock authorized (in shares) | shares   50,000,000 50,000,000   50,000,000        
Preferred stock par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001            
Provision for debt expense   $ 0 $ 100 $ 0          
Note receivable, impairment charges     500 500          
Inventory   16 189            
Gain on contract termination   891 0 0          
Amortization expense   100 $ 400 $ 0          
Estimated future amortization, year one   100              
Estimated future amortization, year two   100              
Estimated future amortization, year three   100              
Estimated future amortization, year four   100              
Estimated future amortization, year five   $ 100              
Stock split, conversion ratio 2                
Minimum                  
Accounting Policies [Line Items]                  
Accounts receivable payment terms   30 days              
Property and equipment estimated useful lives   2 years              
Warranty term   12 months              
Maximum                  
Accounting Policies [Line Items]                  
Accounts receivable payment terms   45 days              
Property and equipment estimated useful lives   7 years              
Warranty term   24 months              
Tinuum Group                  
Accounting Policies [Line Items]                  
Ownership interest, percent   42.50% 42.50%   42.50%        
Tinuum Services                  
Accounting Policies [Line Items]                  
Ownership interest, percent   50.00%     50.00%       50.00%
Highview Enterprises Limited                  
Accounting Policies [Line Items]                  
Ownership interest, percent               8.00%  
Highview Enterprises Limited | Licensed technology                  
Accounting Policies [Line Items]                  
Long-term licensing agreement, termination fee   $ 200     £ 0.2 $ 200 £ 0.2    
Gain on contract termination   $ 200