Stockholders’ Equity (Tables)
|
6 Months Ended |
Jun. 30, 2018 |
|---|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Stock Option Activity |
|
|
|
|
|
|
|
|
Options
|
|
Outstanding at December 31, 2016
|
5,757,880
|
|
Granted
|
3,027,500
|
|
Exercised
|
(152,085)
|
|
Forfeit/canceled
|
(1,451,053)
|
|
Expired
|
(363,294)
|
|
Outstanding at December 31, 2017
|
6,818,948
|
|
Granted
|
550,000
|
|
Exercised
|
(12,500)
|
|
Forfeit/canceled
|
(1,162,319)
|
|
Expired
|
(1,229,878)
|
|
Outstanding at June 30, 2018
|
4,964,251
|
|
|
|
|
| Stock-Based Compensation Expense |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Three Months Ended
|
Six Months Ended
|
|
|
|
June 30,
|
June 30,
|
|
|
|
2018
|
|
2017
|
2018
|
|
2017
|
|
General and administrative
|
|
$
|
62,187
|
|
$
|
224,817
|
$
|
217,851
|
|
$
|
447,361
|
|
Sales and marketing
|
|
|
55,617
|
|
|
31,440
|
|
124,097
|
|
|
63,604
|
|
Engineering, research, and development
|
|
|
37,098
|
|
|
55,749
|
|
65,796
|
|
|
75,935
|
|
|
|
$
|
154,902
|
|
$
|
312,006
|
$
|
407,744
|
|
$
|
586,900
|
|
| Valuation Assumptions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Six Months Ended
|
|
|
|
June 30,
|
|
|
|
2018
|
|
2017
|
|
Risk-free interest rate
|
|
2.68%
|
|
2.04%
|
|
Expected life (years)
|
|
6.00
|
|
6.00
|
|
Expected dividend yield
|
|
-
|
|
-
|
|
Expected volatility
|
|
101.94%
|
|
85.63%
|
|
| Restricted Stock Unit Activity |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Shares
|
|
Weighted Average
Grant Date Fair Value
|
|
Weighted Average
Remaining
Contractual Term
(Years)
|
|
Aggregate
Intrinsic Value
|
|
Outstanding at December 31, 2016
|
|
|
994,417
|
|
$
|
0.72
|
|
|
0.08
|
|
$
|
731,845
|
|
Awarded
|
|
|
199,513
|
|
$
|
0.73
|
|
|
0.70
|
|
$
|
-
|
|
Released
|
|
|
(484,058)
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Canceled/forfeited/expired
|
|
|
(47,072)
|
|
$
|
0.72
|
|
|
-
|
|
$
|
-
|
|
Outstanding at December 31, 2017
|
|
|
662,800
|
|
$
|
0.72
|
|
|
0.70
|
|
$
|
795,360
|
|
Awarded
|
|
|
-
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Released
|
|
|
-
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Canceled/forfeited/expired
|
|
|
-
|
|
$
|
-
|
|
|
-
|
|
$
|
-
|
|
Outstanding at June 30, 2018
|
|
|
662,800
|
|
$
|
0.33
|
|
|
0.75
|
|
$
|
516,984
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Expected to vest at June 30, 2018
|
|
|
662,800
|
|
$
|
-
|
|
|
-
|
|
$
|
516,984
|
|
Vested at June 30, 2018
|
|
|
417,770
|
|
$
|
-
|
|
|
-
|
|
$
|
325,861
|
|
Unvested at June 30, 2018
|
|
|
245,030
|
|
$
|
-
|
|
|
-
|
|
$
|
191,123
|
|
Unrecognized expense at June 30, 2018
|
|
$
|
162,687
|
|
|
|
|
|
|
|
|
|
|
| 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,
|
|
|
|
2018
|
|
2017
|
|
2018
|
|
2017
|
|
General and administrative
|
|
$
|
8,702
|
|
$
|
56,416
|
|
$
|
30,546
|
|
$
|
118,940
|
|
|
|
$
|
8,702
|
|
$
|
56,416
|
|
$
|
30,546
|
|
$
|
118,940
|
|