Commitments and Contingencies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Rent expense	$ 1,300,000	$ 2,100,000
Lawsuit expense recorded	100,000
Alphatec Spine, Inc.
Loss Contingencies [Line Items]
Guaranteed obligated minimum royalty payments through 2022 and beyond	$ 6,500,000
Building lease
Loss Contingencies [Line Items]
Lease term	Jul. 31, 2021
First year | Building lease
Loss Contingencies [Line Items]
Lease rent payable per month	$ 105,000
Each year thereafter | Building lease
Loss Contingencies [Line Items]
Lease rent payable increase per month	$ 3,000