Commitments and Contingencies - Litigation (Details)		3 Months Ended	12 Months Ended
	Sep. 27, 2016 USD ($)	Mar. 31, 2017 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)
Commitments and Contingencies
Number of claims | item		2
Insurance proceeds			$ 187,500
Paid legal award	$ 2,375,000		$ (950,000)
Outstanding settlement amount		$ 2,355,000		$ 2,355,000
Insurance receivable		$ 2,335,000		$ 2,335,000