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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

 

     Balance at
beginning of
period		      Additions      Deduction      Balance at
end of period		  

Year ended December 31, 2016

Allowance for doubtful accounts

    $ 25      $ —        $ 25      $ —    

Year ended December 31, 2015

Allowance for doubtful accounts

    $ 25      $ —        $ —        $ 25  

Year ended December 31, 2014

Allowance for doubtful accounts

    $ —        $ 25      $ —        $ 25