Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Change in Carrying Amount of Goodwill
The change in the carrying amount of goodwill is as follows (in thousands):
 
Carrying Amount
Balance at December 31, 2015
$
20,899

Impairment of goodwill
(20,899
)
Balance at December 31, 2016
$
—