Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator (both basic and diluted):
Net loss	$ (27,476)	$ (30,531)
Denominator:
Denominator for basic and diluted loss per share (in shares)	26,850,499	26,336,044
Basic loss per common share (in dollars per share)	$ (1.02)	$ (1.16)
Diluted loss per common share (in dollars per share)	$ (1.02)	$ (1.16)