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Warrants
 12 Months Ended
Dec. 31, 2016
Derivative Financial Instruments Indexed to, and Potentially Settled in, Entity's Own Stock [Abstract]  
Warrants
11.
Warrants
 
A summary of warrants outstanding and exercisable as of December 31, 2016 (in thousands, except as noted):
 
 
 
Warrants Outstanding
 
 
Warrants Exercisable
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Average
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Remaining
 
 
Weighted
 
 
 
 
 
Weighted
 
 
 
Number
 
 
Contractual
 
 
Average
 
 
Number
 
 
Average
 
Year Issued
 
Outstanding
 
 
Life
 
 
Exercise Price
 
 
Exercisable
 
 
Exercise Price
 
 
 
 
 
 
(in years)
 
 
(per share)
 
 
 
 
 
(per share)
 
2013
 
 
10
 
 
 
1.3
 
 
$
0.90
 
 
 
10
 
 
$
0.90
 
2014 (Note 9)
 
 
2,750
 
 
 
2.1
 
 
 
4.74
 
 
 
2,750
 
 
 
4.74
 
2015
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
2016 (Note 9)
 
 
3,191
 
 
 
5.0
 
 
$
2.31
 
 
 
-
 
 
 
-
 
 
 
 
5,951
 
 
 
3.6
 
 
$
3.43
 
 
 
2,760
 
 
$
4.73