Deposits and Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Short-term
Receivable due from the FDA	$ 0	$ 2,038
Deposits on equipment	0	1,201
Other	438	255
Total short-term deposits and other assets	438	3,494
Long-term
Deposits on equipment	1,081	499
Other	16	54
Total long-term deposits and other assets	1,097	553
Other Assets	$ 1,535	$ 4,047