Stockholders' Equity (Deficit) (Tables)
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9 Months Ended |
12 Months Ended |
Sep. 30, 2015 |
Dec. 31, 2014 |
| Stockholders' Equity [Abstract] |
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| Summary of Activity of Common Stock Warrants Retroactively Adjusted for Reverse Stock Split |
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|
Common Stock
Warrants |
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|
Outstanding, December 31, 2012
|
|
|
53,159 |
|
|
Granted to underwriters
|
|
|
125,000 |
|
|
Exercised
|
|
|
— |
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Expired
|
|
|
— |
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Outstanding, December 31, 2013
|
|
|
178,159 |
|
|
Granted to lenders
|
|
|
52,695 |
|
|
Exercised
|
|
|
(88,462 |
) |
|
Expired
|
|
|
— |
|
|
Outstanding, December 31, 2014
|
|
|
142,392 |
|
|
| Schedule of Components of Stock-based Compensation Included in Net Loss |
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For the years ended |
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December 31,
|
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|
|
2014 |
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|
2013 |
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|
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Employee stock options
|
|
$ |
570,760 |
|
|
$ |
131,178 |
|
|
Non-employee stock options
|
|
|
495,683 |
|
|
|
415,212 |
|
|
Restricted stock awards
|
|
|
— |
|
|
|
25,534 |
|
| |
|
$ |
1,066,443 |
|
|
$ |
571,924 |
|
|
| Schedule of Stock Option Valuation Assumptions |
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|
|
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Dividend yield
|
|
|
0.0 |
% |
|
Expected volatility
|
|
|
83.62 |
% |
|
Risk-free interest rate
|
|
|
1.63 |
% |
|
Expected lives (years)
|
|
|
6.0 |
|
|
|
|
December 31,
|
|
|
|
2014 |
|
|
2013 |
|
|
Dividend yield
|
|
|
0.0 |
% |
|
|
0.0 |
% |
|
Expected volatility
|
|
|
107-110 |
% |
|
|
90-112 |
% |
|
Risk-free interest rate
|
|
|
2.06-2.23 |
% |
|
|
1.39-2.26 |
% |
|
Expected lives (years)
|
|
|
5.9-6.5 |
|
|
|
5.75-6.5 |
|
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| Schedule of Stock Option Activity |
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|
Shares
|
|
|
Weighted
Average
Exercise
Price
|
|
|
Outstanding, December 31, 2014
|
|
|
1,018,590 |
|
|
$ |
5.04 |
|
|
Granted
|
|
|
277,875 |
|
|
$ |
6.09 |
|
|
Exercised
|
|
|
(10,272 |
) |
|
$ |
1.97 |
|
|
Forfeited
|
|
|
(179,298 |
) |
|
$ |
6.50 |
|
|
Outstanding, September 30, 2015
|
|
|
1,106,895 |
|
|
$ |
5.10 |
|
|
|
|
|
|
|
|
|
|
|
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Shares
|
|
|
Weighted
Average
Exercise
Price
|
|
|
Outstanding, December 31, 2012
|
|
|
590,047 |
|
|
$ |
0.71 |
|
|
Granted
|
|
|
186,736 |
|
|
$ |
10.07 |
|
|
Exercised
|
|
|
(80,706 |
) |
|
$ |
0.67 |
|
|
Forfeited
|
|
|
(62,595 |
) |
|
$ |
1.96 |
|
|
Outstanding, December 31, 2013
|
|
|
633,482 |
|
|
$ |
3.36 |
|
|
Granted
|
|
|
507,879 |
|
|
$ |
6.30 |
|
|
Exercised
|
|
|
(78,664 |
) |
|
$ |
0.60 |
|
|
Forfeited
|
|
|
(44,107 |
) |
|
$ |
3.19 |
|
|
Outstanding, December 31, 2014
|
|
|
1,018,590 |
|
|
$ |
5.04 |
|
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| Schedule of Options Outstanding, Exercisable, and Vested or Expected to Vest |
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Options Outstanding
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Options Vested and Exercisable
|
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|
Balance
as of
9/30/2015
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|
Weighted
Average
Remaining
Contractual
Life
(Years)
|
|
Weighted
Average
Exercise
Price
|
|
Balance
as of
9/30/2015
|
|
Weighted
Average
Remaining
Contractual
Life
(Years)
|
|
Weighted
Average
Exercise
Price
|
|
| 1,106,895 |
|
|
7.4 |
|
$ |
5.10 |
|
|
649,421 |
|
|
6.2 |
|
$ |
3.89 |
|
|
|
Options Outstanding
|
|
Options Exercisable
|
|
Options Vested or Expected to Vest
|
|
Balance
as of
12/31/2014
|
|
Weighted
Average
Remaining
Contractual
Life
(Years)
|
|
Weighted
Average
Exercise
Price
|
|
Balance
as of
12/31/2014
|
|
Weighted
Average
Remaining
Contractual
Life
(Years)
|
|
Weighted
Average
Exercise
Price
|
|
Balance
as of
12/31/2014
|
|
Weighted
Average
Remaining
Contractual
Life
(Years)
|
|
Weighted
Average
Exercise
Price
|
| 1,018,590 |
|
7.81 |
|
$5.04 |
|
473,696 |
|
5.99 |
|
$2.67 |
|
473,696 |
|
5.99 |
|
$2.67 |
|