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12. Restructuring (Tables)
3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Accrued restructuring costs

A summary of accrued restructuring costs, included as a component of accounts payable and accrued expenses on the unaudited condensed consolidated balance sheets, is as follows (in thousands):

      December 31,
2017
    Charges     Cash     Non-cash     March 31,
2018
2018 Restructuring    $ -     $ 717    $ (717)   $ -     $ -  
                               
      December 31,
2017
    Charges     Cash     Non-cash     March 31,
2018
2016 Restructuring     $ 265    $ 112    $ (125)   $ -     $ 252