Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) (Details)

v3.6.0.2
Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information [Line Items]                      
Total revenue $ 35 $ 26 $ 15,004 $ 0 $ 0 $ 0 $ 760 $ 911 $ 15,065 $ 1,671 $ 3,646
Net income (loss) $ (2,327) $ (2,620) $ 11,928 $ (1,846) $ (2,294) $ (1,807) $ (2,281) $ (4,897) $ 5,135 $ (11,279) $ (2,403)
Basic net income (loss) per share $ (0.11) $ (0.12) $ 0.58 $ (0.09) $ (0.11) $ (0.09) $ (0.11) $ (0.24) $ 0.25 $ (0.56) $ (0.14)
Diluted net income (loss) per share $ (0.15) $ (0.12) $ 0.55 $ (0.09) $ (0.11) $ (0.09) $ (0.11) $ (0.24) $ 0.20 $ (0.56) $ (0.20)