Equity Incentive Plan - Options Rollforward (Details) - $ / shares
|
12 Months Ended |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
|
|
|
| Balance at beginning of period |
528,750
|
445,417
|
|
| Granted |
37,500
|
425,000
|
|
| Forfeited or cancelled |
(42,500)
|
(341,667)
|
|
| Balance at end of period |
523,750
|
528,750
|
445,417
|
| Non-exercisable |
(148,333)
|
(288,750)
|
|
| Outstanding and exercisable at end of period |
375,417
|
240,000
|
|
| Granted, grant date fair value |
$ 0.58
|
$ 0.78
|
|
| Weighted Average Price |
|
|
|
| Weighted average exercise price, beginning |
9.57
|
26.20
|
|
| Granted, weighted average exercise price |
4.00
|
4.00
|
|
| Forfeited or cancelled, weighted average exercise price |
4.00
|
24.12
|
|
| Weighted average exercise price, ending |
9.63
|
9.57
|
$ 26.20
|
| Non-exercisable, weighted average price |
4.00
|
4.00
|
|
| Outstanding and exercisable, weighted average price |
$ 11.85
|
$ 16.28
|
|
| Weighted Average Remaining Contractual Term |
|
|
|
| Weighted average remaining contractual term, outstanding |
7 years 2 months 12 days
|
8 years 1 month 6 days
|
6 years 10 months 24 days
|
| Weighted average remaining contractual term, granted |
8 years 4 months 24 days
|
8 years 7 months 6 days
|
|
| Weighted average remaining contractual term, forfeited or cancelled |
7 years 8 months 12 days
|
6 years 9 months 18 days
|
|
| Weighted average remaining contractual term, non-exercisable |
8 years 3 months 18 days
|
8 years 10 months 24 days
|
|
| Weighted average remaining contractual term, exercisable |
6 years 8 months 12 days
|
7 years 2 months 12 days
|
|