|
Warrant derivative liability (Unit options) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
1 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2008
|
Dec. 31, 2013
|
Dec. 31, 2014
|
Dec. 31, 2012
|
||||||
| Unit Options [Member] | |||||||||
| Warrant Activity [Line Items] | |||||||||
| Granted units | 280,000 | ||||||||
| Per unit selling price | $ 10.00 | ||||||||
| Warrants outstanding | 280,000 | [1] | [1] | 280,000 | [1] | ||||
| Exercise price of warrant | $ 9.98 | ||||||||
| Market price per share | $ 0 | ||||||||
| Estimated warrant value | $ 6 | ||||||||
| Estimated warrant value per share | 0.02 | ||||||||
| Estimated warrant exercise price | $ 3.39 | ||||||||
| Expected remaining term | 3 months | ||||||||
| Expected volatility | 30.00% | ||||||||
| Risk-free interest rate | 0.05% | ||||||||
| Representative Warrants [Member] | |||||||||
| Warrant Activity [Line Items] | |||||||||
| Exercise price of warrant | $ 8.00 | ||||||||
| Expiration date | Mar. 07, 2014 | ||||||||
|
|||||||||