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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Cash and cash equivalents | $ 108,238 | $ 160,203
Accounts payable | $ 2,708 | $ 7,698
Common stock, par value (USD per share) | $ 0.001 | $ 0.001
Common stock, shares authorized | 33,333,333 | 33,333,333
Common stock, shares issued | 19,837,109 | 19,575,150
Common stock, shares outstanding | 19,837,109 | 19,575,150
Viking |  |
Cash and cash equivalents | $ 0 | $ 756
Accounts payable | $ 0 | $ 2,211

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