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Warrants
 12 Months Ended
Dec. 31, 2017
Derivative Financial Instruments Indexed to, and Potentially Settled in, Entity's Own Stock [Abstract]  
Warrants
12.
Warrants
 
A summary of warrants outstanding and exercisable as of December 31, 2017 (in thousands, except as noted):
 
 
 
Warrants Outstanding
 
Warrants Exercisable
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Average
 
Weighted
 
 
 
 
Weighted
 
 
 
 
 
 
Remaining
 
Average
 
 
 
 
Average
 
 
 
Number
 
Contractual
 
Exercise
 
Number
 
Exercise
 
Year Issued
 
Outstanding
 
Life
 
Price
 
Exercisable
 
Price
 
 
 
 
 
 
(in years)
 
(per share)
 
 
 
 
(per share)
 
2008
 
 
1
 
 
0.3
 
$
9.00
 
 
1
 
$
9.00
 
2014
 
 
25
 
 
1.1
 
 
47.40
 
 
25
 
 
47.40
 
2016 (Note 10)
 
 
128
 
 
4.0
 
 
23.30
 
 
128
 
 
23.30
 
2017 (Note 10)
 
 
1,124
 
 
4.7
 
$
5.10
 
 
1,108
 
 
5.10
 
 
 
 
1,278
 
 
4.5
 
$
7.70
 
 
1,262
 
$
7.80