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Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
May 11, 2017
USD ($)
unit
Jun. 15, 2016
$ / shares
shares
Dec. 31, 2017
USD ($)
segment
unit
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Sep. 15, 2016
$ / shares
Mar. 28, 2016
$ / shares
Jan. 25, 2016
$ / shares
Business Acquisition [Line Items]              
Reverse stock split conversion ratio   0.0667          
Common stock, shares authorized (shares) | shares   240,000,000 240,000,000 240,000,000      
Common stock, par value (usd per share) | $ / shares   $ 0.04 $ 0.04 $ 0.04 $ 0.04 $ 0.04 $ 0.04
Goodwill     $ 8,759 $ 633      
Inventory, finished goods     500 700      
Inventory, components     $ 500 $ 400      
Number of operating segments | segment     1        
Number of reportable segments | segment     1        
Number of reporting units | unit     1        
Provant              
Business Acquisition [Line Items]              
Goodwill $ 8,100   $ 8,126        
Deferred tax liability assumed in merger included in goodwill $ 700            
Number of reporting units | unit 1