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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Carrying value and estimated fair value of convertible notes and long-term debt
The carrying amount and estimated fair value of the Company’s long-term debt are as follows (in thousands):
 
December 31,
 
2017
 
2016
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Borrowings under revolving credit facility
$
27,950

 
$
27,950

 
$
38,566

 
$
38,566

Term loan
—

 
—

 
9,833

 
9,833