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Shareholders' equity (Details) (USD $)
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0 Months Ended | ||
|---|---|---|---|
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Jul. 30, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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| Equity [Abstract] | |||
| Issuance of Stock (in shares) | 3,846,000 | ||
| Share price of IPO (in dollars per share) | $ 12.00 | ||
| Gross proceeds form IPO | $ 46,200,000 | ||
| Net proceeds from IPO | 40,800,000 | ||
| Debt Instrument, Convertible, Conversion Ratio | 1 | ||
| IPO triggered automatic exercise of warrants, number of warrants | $ 8,208 | ||
| Automatic exercise of warrants, strike price of each warrant (in dollars per warrant) | 0.10 | ||
| Common Stock Authorized (in shares) | 100,000,000 | 135,715,623 | |
| Authorized Preferred Stock (in shares) | 10,000,000 | 0 | |
| Preferred Stock, Shares Issued | 0 | 0 |