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Net Loss Per Share - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]      
Net loss $ (29,901) $ (54,063) $ (15,243)
Basic and diluted shares:      
Weighted average common shares outstanding (in shares) 113,562,738 91,122,291 40,246,663
Net loss per share attributable to common stockholders:      
Basic and diluted net loss per share applicable to common stockholders (in dollars per share) $ (0.26) $ (0.59) $ (0.38)