Quarterly report pursuant to Section 13 or 15(d)

Underwritten and Registered Direct Placement of Common Stock (Details)

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Underwritten and Registered Direct Placement of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
9 Months Ended
Aug. 28, 2015
May. 06, 2014
Dec. 31, 2015
Dec. 31, 2014
Stockholders' Equity        
Issuance of common stock, net of issuance costs (in shares)   0.9 2.8  
Share price (in dollars per share)   $ 34.00    
Net proceeds from sale of the common stock, after deducting fees and other offering expenses (in dollars)       $ 29,772
Proceeds from sale of common stock, after deducting fees and other offering expense $ 30,000 $ 29,800 $ 7,412