Commitments and Contingencies - Other (Details) - Agreement with the Regents		2 Months Ended	12 Months Ended
	Dec. 30, 2014 USD ($) item	Aug. 28, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Other commitments
Commitment obligation	$ 2,700,000
Number of payments to be made in current fiscal year | item	5
Minimum required annual payment of the commitment obligation, based on net sales of current and future products	$ 500,000
Commitment obligation payments		$ 1,800,000	$ 2,800,000	$ 1,800,000
Period of time for repayment of commitment obligation from date of IPO	60 days