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v3.3.1.900

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2015 | Dec. 15, 2014 | Aug. 18, 2014 | Jul. 22, 2013 | May. 02, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 29, 2012
Shareholders' Equity |  |  |  |  |  |  |  |  |
Common stock, authorized shares |  |  |  |  |  | 500,000,000 | 500,000,000 |  |
Common stock, par value (in dollars per share) |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Common stock, issued shares |  |  |  |  |  | 61,813,995 | 49,806,131 |  |
Common stock, outstanding shares |  |  |  |  |  | 61,813,995 | 49,806,131 |  |
Common stock disclosures |  |  |  |  |  |  |  |  |
Number of shares issued under underwritten public offering | 11,500,000 |  | 10,235,000 | 6,900,000 |  |  |  |  |
Number of share's exercise in full of over-allotment option by underwriter | 1,500,000 |  | 1,335,000 | 900,000 |  |  |  |  |
Shares price (in dollars per share) | $ 20.65 |  | $ 11.25 | $ 10.40 |  |  |  |  |
Underwriter's discount and offering expenses | $ 14,500 |  | $ 7,100 | $ 4,700 |  |  |  |  |
Net proceeds from the sale of shares | $ 222,900 |  | $ 108,000 | $ 67,000 |  | $ 222,942 | $ 109,013 | $ 67,017 |
Preferred stock |  |  |  |  |  |  |  |  |
Preferred stock, authorized |  |  |  |  |  | 200,000,000 | 200,000,000 |  |
Preferred stock, par value |  |  |  |  |  | $ 0.01 | $ 0.01 |  |
Preferred stock, shares issued |  |  |  |  |  | 0 | 0 |  |
Preferred stock, shares outstanding |  |  |  |  |  | 0 | 0 |  |
Warrant |  |  |  |  |  |  |  |  |
Warrant disclosures |  |  |  |  |  |  |  |  |
Warrant to purchase common stock, number of shares |  |  |  |  |  | 0 |  |  | 329,932
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.94
Fair value of warrant |  |  |  |  | $ 800 |  |  |  |
Warrant Shares issued and delivered |  |  |  |  | 223,431 |  |  |  |
Warrant Shares outstanding |  |  |  |  |  | 0 |  |  |
Stock options |  |  |  |  |  |  |  |  |
Common stock disclosures |  |  |  |  |  |  |  |  |
Common stock shares reserved for issuance |  |  |  |  |  | 5,273,722 |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |
Common stock disclosures |  |  |  |  |  |  |  |  |
Common stock shares reserved for issuance |  |  |  |  |  | 43,554 |  |  |
Hercules |  |  |  |  |  |  |  |  |
Common stock disclosures |  |  |  |  |  |  |  |  |
Number of shares issued under underwritten public offering |  | 70,771 |  |  |  |  |  |  |
Shares price (in dollars per share) |  | $ 14.13 |  |  |  |  |  |  |
Net proceeds from the sale of shares |  | $ 1,000 |  |  |  |  |  |  |

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