Unaudited Quarterly Financial Data (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 Disclosure [Abstract]
Revenues	$ 9,568	$ 12,596	$ 15,175	$ 17,822	$ 18,201	$ 21,677	$ 18,683	$ 15,103	$ 55,161	$ 73,664	$ 79,017
Cost of sales	7,717	7,281	9,595	11,774	11,294	13,829	11,547	8,437	36,367	45,107	43,889
Net (loss)	$ (9,104)	$ (3,019)	$ (2,628)	$ (2,637)	$ (9,066)	$ (289)	$ (1,371)	$ (1,654)	$ (17,388)	$ (12,380)	$ (17,725)
Basic (in dollars per share)	$ (0.39)	$ (0.13)	$ (0.11)	$ (0.11)	$ (0.39)	$ (0.01)	$ (0.06)	$ (0.07)	$ (0.74)	$ (0.54)	$ (0.78)
Diluted (in dollars per share)	$ (0.39)	$ (0.13)	$ (0.11)	$ (0.11)	$ (0.39)	$ (0.01)	$ (0.06)	$ (0.07)	$ (0.74)	$ (0.54)	$ (0.78)