Commitments and Contingencies - Additional Information (Details) - USD ($)		3 Months Ended
	Sep. 28, 2015	Mar. 31, 2018	Mar. 31, 2017	Sep. 29, 2015
Other Commitments [Line Items]
Rent expense for operating leases		$ 1,100,000	$ 700,000
Beanstock and Adaptive
Other Commitments [Line Items]
Gain contingency				$ 10,000,000
Beanstock and Adaptive | Adaptive
Other Commitments [Line Items]
Damages sought (greater than)	$ 600,000
Capital leases | Minimum
Other Commitments [Line Items]
Interest rates		3.90%
Capital leases | Maximum
Other Commitments [Line Items]
Interest rates		7.80%
The 401 K Retirement Plan
Other Commitments [Line Items]
Company match expense		$ 200,000	$ 100,000