Net Loss Per Share - Calculation of net loss per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator (both basic and diluted)
Net loss	$ (24,351)	$ (12,940)
Denominator
Denominator for basic earnings (loss) per share (in shares)	55,996	34,993
Denominator for diluted earnings (loss) per share (in shares)	55,996	34,993
Basic loss per common share (in dollars per share)	$ (0.43)	$ (0.37)
Diluted loss per common share (in dollars per share)	$ (0.43)	$ (0.37)