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Shareholders' equity
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12 Months Ended |
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Dec. 31, 2013
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| Equity [Abstract] | |
| Stockholders' equity | Shareholders' equity On July 30, 2013, the Company closed its IPO of 3,846,000 shares of its common stock. The public offering price of the shares sold in the offering was $12.00 per share. The total gross proceeds from the offering to the Company were $46.2 million. After deducting underwriting discounts and commissions and offering expenses payable by the Company, the aggregate net proceeds received by the Company totaled approximately $40.8 million. Immediately prior to the consummation of the IPO, all outstanding shares of Series A and Series B preferred stock were converted into shares of common stock on a one-for-one basis, and warrants to purchase Series B preferred stock were converted into warrants to purchase shares of common stock on a one-for-one basis. In addition, in connection with the IPO, warrants to purchase 8,208 shares of common stock were exercised at a strike price of $0.10 per share. In connection with the IPO, the Company amended and restated its articles of incorporation to authorize 100,000,000 shares of common stock and 10,000,000 shares of preferred stock. As of December 31, 2013, no shares of preferred stock have been issued. |