Restructuring - Textual Details (Details) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Commercial manufacturing	$ 939,000	$ 465,000
Contract termination obligation, net of current portion	489,000	0
Issuance of stock in connection with private placement, net of offering costs	(296,000)	14,703,000
Transfer of equipment to settle contractual liability	111,000	0
Biopolymer Production Agreements
Restructuring Cost and Reserve [Line Items]
Commercial manufacturing	$ 933,000
Issuance of stock in connection with private placement (in shares)	275
Issuance of stock in connection with private placement, net of offering costs	$ 85,000
Transfer of equipment to settle contractual liability	111,000
Employee severance
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 238,000	$ 0