Summary of Quarterly Financial Information (Unaudited) (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
Summary of Quarterly Financial Information (Unaudited)
Net sales	$ 6,488	$ 6,531	$ 6,244	$ 1,471	$ 1,537	$ 9,929	$ 14,206	$ 12,434	$ 20,734	$ 38,106	$ 44,733
Gross profit	3,927	4,717	4,499	711	990	6,996	10,269	9,197	13,854	27,452	33,233
Net loss	$ (8,073)	$ (9,963)	$ (10,193)	$ (11,937)	$ (28,250)	$ (6,604)	$ (2,992)	$ (3,384)	$ (40,166)	$ (41,230)	$ (5,811)
Net loss per share:
Basic and diluted	$ (0.43)	$ (0.55)	$ (0.56)	$ (0.66)	$ (1.57)	$ (0.43)	$ (0.20)	$ (0.23)	$ (2.20)	$ (2.61)	$ (2.28)