Stockholders' Equity (Tables)
|
6 Months Ended |
Jun. 30, 2017 |
|---|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Stock Option Activity |
|
|
|
|
|
|
|
|
|
|
|
Options
|
|
Outstanding at December 31, 2015
|
|
5,043,228
|
|
Granted
|
|
1,771,500
|
|
Exercised
|
|
-
|
|
Forfeit/canceled
|
|
(577,817)
|
|
Expired
|
|
(479,031)
|
|
Outstanding at December 31, 2016
|
|
5,757,880
|
|
Granted
|
|
2,577,500
|
|
Exercised
|
|
(61,980)
|
|
Forfeit/canceled
|
|
(1,093,694)
|
|
Expired
|
|
(142,995)
|
|
Outstanding at June 30, 2017
|
|
7,036,711
|
|
|
|
|
|
| Stock-Based Compensation Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Three Months Ended
|
|
Six Months Ended
|
|
|
|
June 30,
|
|
June 30,
|
|
|
|
2017
|
|
2016
|
|
2017
|
|
2016
|
|
General and administrative
|
|
$
|
224,817
|
|
$
|
232,003
|
|
$
|
447,361
|
|
$
|
485,990
|
|
Sales and marketing
|
|
|
31,440
|
|
|
81,658
|
|
|
63,604
|
|
|
172,001
|
|
Engineering, research, and development
|
|
|
55,749
|
|
|
38,599
|
|
|
75,935
|
|
|
83,615
|
|
|
|
$
|
312,006
|
|
$
|
352,260
|
|
$
|
586,900
|
|
$
|
741,606
|
|
| Valuation Assumptions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Six Months Ended
|
|
|
|
June 30,
|
|
|
|
2017
|
|
2016
|
|
Risk-free interest rate
|
|
1.97
|
%
|
|
1.56
|
%
|
|
Expected life (years)
|
|
6.00
|
|
|
6.00
|
|
|
Expected dividend yield
|
|
-
|
%
|
|
-
|
%
|
|
Expected volatility
|
|
85
|
%
|
|
114
|
%
|
|
| Restricted Stock Unit Activity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares
|
|
Weighted Average
Grant Date Fair Value
|
|
Weighted Average
Remaining
Contractual Term
(Years)
|
|
Aggregate
Intrinsic Value
|
|
Outstanding at December 31, 2015
|
|
|
653,937
|
|
$
|
0.32
|
|
|
0.08
|
|
$
|
305,572
|
|
Awarded
|
|
|
340,480
|
|
$
|
0.72
|
|
|
0.70
|
|
$
|
-
|
|
Released
|
|
|
-
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Canceled/forfeited/expired
|
|
|
-
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Outstanding at December 31, 2016
|
|
|
994,417
|
|
$
|
0.72
|
|
|
0.70
|
|
$
|
731,845
|
|
Awarded
|
|
|
1,199,513
|
|
$
|
0.62
|
|
|
-
|
|
$
|
-
|
|
Released
|
|
|
-
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Canceled/forfeited/expired
|
|
|
(47,072)
|
|
$
|
0.72
|
|
|
-
|
|
$
|
-
|
|
Outstanding at June 30, 2017
|
|
|
2,146,858
|
|
$
|
0.56
|
|
|
0.45
|
|
$
|
1,696,018
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Expected to vest at June 30, 2017
|
|
|
2,146,858
|
|
$
|
-
|
|
|
-
|
|
$
|
1,696,018
|
|
Exercisable at June 30, 2017
|
|
|
1,113,245
|
|
$
|
-
|
|
|
-
|
|
$
|
879,464
|
|
Unvested at June 30, 2017
|
|
|
1,033,613
|
|
$
|
-
|
|
|
-
|
|
$
|
816,554
|
|
Unrecognized expense at June 30, 2017
|
|
$
|
738,910
|
|
|
|
|
|
|
|
|
|
|
| Restricted Stock Units (RSUs) [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Stock-Based Compensation Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Three Months Ended
|
|
Six Months Ended
|
|
|
|
June 30,
|
|
June 30,
|
|
|
|
2017
|
|
2016
|
|
2017
|
|
2016
|
|
General and administrative
|
|
$
|
56,416
|
|
$
|
20,087
|
|
$
|
118,940
|
|
$
|
57,587
|
|
|
|
$
|
56,416
|
|
$
|
20,087
|
|
$
|
118,940
|
|
$
|
57,587
|
|