Stock-based Plans and Stock-based Compensation (Tables)
|
12 Months Ended |
Dec. 31, 2017 |
|---|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock Option Activity |
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Shares
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Weighted
Average
Exercise Price
|
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Weighted
Average
Remaining
Contractual
Term (Years)
|
|
Aggregate
Intrinsic Value
|
|
Outstanding at December 31, 2015
|
|
|
5,043,228
|
|
$
|
1.37
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|
|
8.12
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$
|
209,690
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Granted
|
|
|
1,771,500
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$
|
0.72
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-
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$
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-
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Forfeit/canceled
|
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(577,817)
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$
|
1.01
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-
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$
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-
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Expired
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(479,031)
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$
|
1.73
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-
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$
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-
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Outstanding at December 31, 2016
|
|
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5,757,880
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$
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1.37
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|
8.12
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$
|
209,690
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Granted
|
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3,027,500
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$
|
0.69
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-
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$
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-
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Exercised
|
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(152,085)
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$
|
0.54
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-
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$
|
55,574
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Forfeit/canceled
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(1,451,053)
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$
|
0.70
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|
-
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$
|
-
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Expired
|
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(363,294)
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$
|
1.10
|
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|
-
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$
|
-
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Outstanding at December 31, 2017
|
|
|
6,818,948
|
|
$
|
1.07
|
|
|
7.93
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$
|
1,945,356
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|
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Expected to vest at December 31, 2017
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6,818,948
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$
|
1.07
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|
7.93
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$
|
1,945,356
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Exercisable at December 31, 2017
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|
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2,894,853
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$
|
1.49
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|
|
6.47
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$
|
185,184
|
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Unrecognized expense at December 31, 2017
|
|
$
|
2,080,959
|
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| Stock-Based Compensation Expense |
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Years ended December 31,
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2017
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2016
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General and administrative
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$
|
570,170
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$
|
953,206
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Sales and marketing
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166,083
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343,447
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Engineering, research, and development
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175,443
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165,225
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$
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911,696
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$
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1,461,878
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| Valuation Assumptions |
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Years ended December 31,
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2017
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2016
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Risk-free interest rate
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|
1.86% to 2.20%
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1.23% to 1.84%
|
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Expected life (years)
|
|
6.00
|
|
6.00
|
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Dividend yield
|
|
-
|
|
-
|
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Expected volatility
|
|
84.42% to 85.79%
|
|
113.97% to 114.55%
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| Restricted Stock Unit Activity |
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Shares
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Weighted
Average
Grant Date
Fair Value
|
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Weighted
Average
Remaining
Contractual
Term (Years)
|
|
Aggregate
Intrinsic Value
|
|
Outstanding at December 31, 2015
|
|
|
653,937
|
|
$
|
0.32
|
|
|
0.08
|
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$
|
305,572
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Awarded
|
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|
340,480
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$
|
0.72
|
|
|
0.70
|
|
$
|
-
|
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Outstanding at December 31, 2016
|
|
|
994,417
|
|
$
|
0.72
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|
|
0.70
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$
|
731,845
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Awarded
|
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199,513
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$
|
0.73
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|
-
|
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$
|
-
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Released
|
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(484,058)
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$
|
-
|
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|
-
|
|
$
|
-
|
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Forfeit
|
|
|
(47,072)
|
|
$
|
0.72
|
|
|
-
|
|
$
|
-
|
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Outstanding at December 31, 2017
|
|
|
662,800
|
|
$
|
0.72
|
|
|
0.70
|
|
$
|
795,360
|
|
Expected to vest at December 31, 2017
|
|
|
662,800
|
|
$
|
0.72
|
|
|
|
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Unrecognized expense at December 31, 2017
|
|
$
|
39,249
|
|
|
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| Restricted Stock Units (RSUs) [Member] |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Stock-Based Compensation Expense |
|
|
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Years ended December 31,
|
|
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2017
|
|
2016
|
|
General and administrative
|
|
$
|
218,601
|
|
$
|
137,291
|
|
|
|
$
|
218,601
|
|
$
|
137,291
|
|