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Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Loss per Share
Net loss	$ (11,816)	$ (5,171)	$ (5,711)	$ (1,709)	$ (4,788)	$ (2,922)	$ (14,928)	$ (9,152)	$ (24,407)	$ (31,790)	$ (38,333)
Weighted average common shares outstanding:
Basic									22,912,217	22,779,377	22,692,139
Diluted									22,912,217	22,779,377	22,692,139
Basic loss per share of common stock	$ (0.51)	$ (0.23)	$ (0.25)	$ (0.07)	$ (0.21)	$ (0.13)	$ (0.66)	$ (0.40)	$ (1.07)	$ (1.40)	$ (1.69)
Diluted loss per share of common stock	$ (0.51)	$ (0.23)	$ (0.25)	$ (0.07)	$ (0.21)	$ (0.13)	$ (0.66)	$ (0.40)	$ (1.07)	$ (1.40)	$ (1.69)

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